[#3025] fix ProcessSpawn on BSD

- Always break after collecting exit status. Previously it broke the
  loop always on failure of waitpid which does happen after calling it
  subsequently, but there is no reason to wait until then.
- When waitpid returns -1 in sync mode, throw exception, except for
  EINTR which happens on signals (usually one time) prior to
  the child process exiting if sigaction is called without SA_RESTART
  which is the default on some systems.
- Only initialize the global IO signal set on the IO service in async
  mode. It makes no sense to do it in sync mode because there is no IO service.
- Swap pid and wpid names to conform to names in `man wait` on BSD.
- Add FAIL() on timer expiration.
- Don't call runOne() the third time in unit tests because it waits for
  the timer to expire.

[#3141] addressed review comments

- Mostly further corrections in ARM docs and in comments.

[#3141] addressed review comments

- refactored code of SvcParam config parser
- added new 2 UTs
- added some more comments in code

[#3141] addressed review comments

- Rephrased some text in ARM docs.
- Added new text to ARM docs.

[#3141] fix compilation error

[#3141] ChangeLog entry

[#3141] ARM docs updated

[#3141] delete excessive dnr.json examples

[#3141] json examples update

[#3141] restore delimiter escaping

[#3141] provide RFC in comments

[#3141] DNRv4 UTs edited

[#3141] option definition UTs fix

[#3141] DNRv6 UTs edited

[#3141] unpack SvcParams from hex data

[#3141] DNRv4 config parser

[#3141] pack SvcParams to buffer

[#3141] unpack dohpath SvcParam

[#3141] unpack port SvcParam

[#3141] unpack alpn SvcParam

[#3141] config parser wip

[#3141] added ALPN-IDs

[#3141] config parsers boilerplate

[#3141] make dnr options type internal

[#3141] List of Service Parametes (DNR) added

[#3141] Doc updated for v6 DNR option

[#3141] ARM updated

 - Added DNR description
 - added to list of supported RFCs
 - Also removed one server limitation that's no longer valid
   (because we have ping-check). Not related, but small enough.

[#3245] Minor UT change

modified:   src/hooks/dhcp/perfmon/tests/monitored_duration_unittests.cc

[#3245] Wordiing fix

modified:   pkt_filter_lpf.cc

[#3245] addressed review

[#3245] Remove wrong doxygen use in UT

modified:   alarm_unittests.cc
modified:   monitored_duration_unittests.cc

[#3245] Moved Alarm into own files

new file:   src/hooks/dhcp/perfmon/alarm.cc
new file:   src/hooks/dhcp/perfmon/alarm.h
new file:   src/hooks/dhcp/perfmon/tests/alarm_unittests.cc

modified:   src/hooks/dhcp/perfmon/Makefile.am
modified:   src/hooks/dhcp/perfmon/monitored_duration.cc
modified:   src/hooks/dhcp/perfmon/monitored_duration.h
modified:   src/hooks/dhcp/perfmon/tests/Makefile.am
modified:   src/hooks/dhcp/perfmon/tests/monitored_duration_unittests.cc

[#3245] Fixed unused variable warning

src/lib/dhcp/pkt_filter_inet6.cc
    PktFilterInet6::openSocket() - added errmsg to exception text as originally intended

[#3245] Adds fundamental classes to perfmon

src/hooks/dhcp/perfmon/monitored_duration.cc
src/hooks/dhcp/perfmon/monitored_duration.h
    New files that add DurationDataInterval, DurationKey, Alarm, and MonitoredDuration classes

src/hooks/dhcp/perfmon/monitored_duration.h
New file of unit tests for new classes

modified:   Makefile.am
modified:   tests/Makefile.am

[#2022] Added a comment about yhe unparking race

[#2022] Added parking points

[#2022] Checkpoint: added methods

[#3025] fix missing include

[#3025] add ChangeLog entry

[#3025] fix distcheck

[#3025] use admin-utils.sh based on location in upgrade scripts

[#3025] address review comments

[#3025] appease shellcheck

 . "${admin_utils}"
  ^--------------^ SC1090: Can't follow non-constant source. Use a directive to specify location.

    version=$(checked_mysql_version)
              ^-------------------^ SC2119: Use checked_mysql_version "$@" if function's $1 should mean script's $1.

... and others that spiraled afterwards

[#3025] simplify logic in ensureSchemaVersion

... and allow kea-admin path to be overridden in tests.

[#3025] re-enable ProcessSpawnTest.isRunningSync

[#3025] fix location detection in kea-admin

[#3025] add isFile

[#3025] document automatic db init

[#3025] add unit tests

[#3025] sync kea-admin in db connection and fix interaction with retry

[#3025] add ability to wait sync in ProcessSpawn

[#3025] add db init on startup to other managers

[#3025] switch io service to DatabaseConnection's

[#3025] minor changes to kea-admin

- Reword 'Database version' to 'Schema version'.
- Remove a newline that was present only when running mysql operations
  and not for postgresql operations. It was more visible since now it
  appeared in the kea logs.
- Remove some extraneous exits. They weren't in the way of anything, but
  weren't doing anything either.

[#3025] add ability to inherit env in ProcessSpawn

[#3025] automatic init of postgresql schema

[#3025] convert db access params to kea-admin

[#3025] automatic init of mysql schema

[#3130] trim trailing slash

[#3185] fixed access invalid iterator

[#2022] Fixed comment

[#2022] Checkpoint: began reorg

[#3231] Fixed some additional comments.

Minor nits in:

src/bin/dhcp4/tests/dhcp4_test_utils.h
src/bin/dhcp6/tests/dhcp6_test_utils.h

[#3231] Refine conditional log in pkt_filter_bpf.cc

modified:   pkt_filter_bpf.cc

[#3231] Fixed build issue under MacOS Sonoma

Added conditional compilation to address MacOS adding
the macro BPF_TIMEVAL to define the structure used
in the bpf header as either "struct timeval" or
"struct timeval32" (64 bit vs 32 bit).  CMSG uses
timeval, BPF uses timeval32.

src/lib/dhcp/pkt_filter_bpf.cc
    PktFilterBPF::receive()

[#3231] Addressed review comments

Minor cleanups, added a ChangeLog entry

[#3231] Log SOCKET RECEIVED TIME support

src/hooks/dhcp/perfmon/perfmon_callouts.cc
    dhcp4_srv_configured()
    dhcp6_srv_configured()
    - added to log socket received time support

src/hooks/dhcp/perfmon/perfmon_messages.mes
    PERFMON_DHCP4_SOCKET_RECEIVED_TIME_SUPPORT
    PERFMON_DHCP6_SOCKET_RECEIVED_TIME_SUPPORT
    - new messages

[#3231] Add log of event stack to Perfmon callouts

src/hooks/dhcp/perfmon/perfmon_callouts.cc
    pkt4_send()
    pkt6_send()
        Added dump off packet event stack as a DEBUG log message

src/hooks/dhcp/perfmon/perfmon_messages.mes
    New messages:
    PERFMON_DHCP4_PKT_EVENTS
    PERFMON_DHCP6_PKT_EVENTS

[#3231] Core task 3 for perfmon

Add packet events and subnet callout argumments
to kea-dhcp4 and kea-dhcp6

src/bin/dhcp4/dhcp4_srv.*
    Dhcpv4Srv::runOne() - add mt_queued packet event to query in MT mode
    Dhcpv4Srv::processPacket() - add "process_started" event to query upon entry
    Dhcpv4Srv::processDhcp4Query() - pass selected subnet (if one) into processPacketPktSend()
    Dhcpv4Srv::sendResponseNoThrow() - add subnet parameter, pass it into processPacketPktSend9()
    Dhcpv4Srv::processPacketPktSend() - add subnet parameter, add "process_completed" event
    to query, add subnet to callout arguments

src/bin/dhcp4/tests/dhcp4_test_utils.cc
src/bin/dhcp4/tests/dhcp4_test_utils.h
src/bin/dhcp4/tests/hooks_unittest.cc
    Updates to verify packet events content add subnet4 callout argument

src/bin/dhcp6/dhcp6_srv.cc
    Dhcpv6Srv::runOne() - add mt_queued packet event to query in MT mode
    Dhcpv6Srv::processPacket() - add "process_started" event to query upon entry
    Dhcpv6Srv::processDhcp6Query() - pass selected subnet (if one) into processPacketPktSend()
    Dhcpv6Srv::sendResponseNoThrow() - add subnet parameter, pass it into processPacketPktSend9()
    Dhcpv6Srv::processPacketPktSend() - add subnet parameter, add "process_completed" event
    to query, add subnet to callout arguments

src/bin/dhcp6/tests/dhcp6_test_utils.cc
src/bin/dhcp6/tests/dhcp6_test_utils.h
src/bin/dhcp6/tests/hooks_unittest.cc
    Updates to verify packet events content add subnet4 callout argument

src/bin/dhcp4/dhcp4_hooks.dox
    Updated pkt4_send arguments

src/bin/dhcp6/dhcp6_hooks.dox
    Updated pkt6_send arguments

[#3207] Format the code

[#3207] Change the member names

[#3207] Add some comments

[#3207] Remove a blank line from Changelog

[#3207] Change the letter case

[#3207] Trim whitespace

[#3207] Update Changelog

[#3207] Replace boost radom with std

[#3207] Remove old implementation

[#3207] Add a wrapper for boost rand generator

[#3207] Remove helper class

[#3207] Remove helper classes

[#3207] Remove weighted random generator

[#2022] fix User-Password example in ARM

[#2022] fix non-matching quotes and indentation

[#2022] Added max-pending-requests doc

[#2022] Checkpoint: last version of parking code

[#3242] Fixed copyright date

[#3242] Addressed comments, added ChangeLog entry

Minor cosmetic fixes.

[#3209] Fixed .gitattributes file

modified:   src/hooks/dhcp/perfmon/.gitattributes

[#3242] Added bare-bones perfmon hook library

New files:
    arm/hooks-perfmon.rst
src/hooks/dhcp/perfmon/.gitattributes
src/hooks/dhcp/perfmon/.gitignore
src/hooks/dhcp/perfmon/Makefile.am
src/hooks/dhcp/perfmon/libloadtests/.gitignore
src/hooks/dhcp/perfmon/libloadtests/Makefile.am
src/hooks/dhcp/perfmon/libloadtests/load_unload_unittests.cc
src/hooks/dhcp/perfmon/libloadtests/run_unittests.cc
src/hooks/dhcp/perfmon/perfmon.dox
src/hooks/dhcp/perfmon/perfmon_callouts.cc
src/hooks/dhcp/perfmon/perfmon_log.cc
src/hooks/dhcp/perfmon/perfmon_log.h
src/hooks/dhcp/perfmon/perfmon_messages.cc
src/hooks/dhcp/perfmon/perfmon_messages.h
src/hooks/dhcp/perfmon/perfmon_messages.mes
src/hooks/dhcp/perfmon/tests/.gitignore
src/hooks/dhcp/perfmon/tests/Makefile.am
src/hooks/dhcp/perfmon/tests/run_unittests.cc
src/hooks/dhcp/perfmon/version.cc

Modified:
configure.ac
arm/hooks-perfmon.rst
arm/hooks.rst
arm/logging.rst
arm/rst_arm_sources.mk
conf.py
src/hooks/dhcp/Makefile.am

[#3230] addressed review

[#3230] Added UT to BPF filter

modified:   tests/pkt_filter_bpf_unittest.cc

[#3230] Added UTs for isSocketReceiveTimeSupported

src/lib/dhcp/tests/pkt_filter_inet6_unittest.cc
src/lib/dhcp/tests/pkt_filter_inet_unittest.cc
src/lib/dhcp/tests/pkt_filter_lpf_unittest.cc
    Added test for isSocketReceivedTimeSupported)

[#3230] Move isSocketReceivedSuppported()

Move isSocketReceivedSuppported() impls out of headers and into
cc files so we're sure SO_TIMESTAMP is known.

[#3230] Addressed review comments

src/lib/dhcp/iface_mgr.*
    IfaceMgr::isSocketReceviedTimeSupported() - new function

src/lib/dhcp/pkt_filter.*
    PktFilter::isSocketReceviedTimeSupported() - new  pure virtual function

src/lib/dhcp/pkt_filter6.cc
src/lib/dhcp/pkt_filter_bpf.h
src/lib/dhcp/pkt_filter_inet.h
src/lib/dhcp/pkt_filter_inet6.h
src/lib/dhcp/pkt_filter_lpf.h
    Added implementation of isSocketReceivedTimeSupported()

src/lib/dhcp/pkt_filter_lpf.cc
    Removed WITH_CMSG and refactored receive() to be a single function
    with conditional codde based on SO_TIMESTAMP

Updated UTs accordingly

[#3230] addressed review

[#3230] Initial commit

Adds dhcp::PktEvent, modifies packet filters and tests

src/lib/dhcp/pkt.*
    Add PktEvent class, add stack and methods to Pkt

src/lib/dhcp/pkt_filter_bpf.cc
    PktFilterBPF::receive() - fetch timestamp from bpfhdr,
    add SOCKET_RECEIVED and BUFFER_READ events

    PktFilterBPF::send() - add RESPONSE_SENT event

src/lib/dhcp/pkt_filter_inet.cc
    PktFilterInet::openSocket() - enable SO_TIMESTAMP socket option

    PktFilterInet::receive() - fetch SO_TIMESTAMP via CMSG,
    add SOCKET_RECEIVED and BUFFER_READ events

    PktFilterInet::send() - add RESPONSE_SENT event

src/lib/dhcp/pkt_filter_inet6.cc
    PktFilterInet6::openSocket() - enable SO_TIMESTAMP socket option

    PktFilterInet6::receive() - fetch SO_TIMESTAMP via CMSG,
    add SOCKET_RECEIVED and BUFFER_READ events

    PktFilterInet::send() - add RESPONSE_SENT event

src/lib/dhcp/pkt_filter_lpf.cc

    PktFilterLPF::openSocket() - enable SO_TIMESTAMP socket option
    PktFilterLPF::receive() - added conditonal compilation version based
    on WITH_CMSG macro that fetches SO_TIMESTAMP and add SOCKET_RECEIVED
    and BUFFER_READ events

    PktFilterLPF::send() - add RESPONSE_SENT event

src/lib/dhcp/tests/pkt4_unittest.cc
    TEST_F(Pkt4Test, PktEvents) - new test

src/lib/dhcp/tests/pkt6_unittest.cc
    TEST_F(Pkt6Test, PktEvents) - new test

src/lib/dhcp/tests/pkt_filter6_test_utils.cc
src/lib/dhcp/tests/pkt_filter6_test_utils.h
src/lib/dhcp/tests/pkt_filter_inet6_unittest.cc
src/lib/dhcp/tests/pkt_filter_inet_unittest.cc
src/lib/dhcp/tests/pkt_filter_test_utils.cc
src/lib/dhcp/tests/pkt_filter_test_utils.h
    Updated tests to check PktEvent stack contents

src/lib/dhcp/tests/pkt_filter_bpf_unittest.cc
src/lib/dhcp/tests/pkt_filter_lpf_unittest.cc
    Updated tests to check PktEvent stack contents,
    Changed DISABLED_ tests to use SKIP_IF(notRoot)

[#3209] Further review comments

modified:   encode/encode.cc

[#3209] Addressed review comments

Minor clean up, added commentary

[#3209] addressed review