[#3107] use const& whenever possible

[#3107] Single-threaded mode for ping-check

doc/sphinx/arm/hooks-ping-check.rst
    Removed note about single-threaded mode

Added ChangeLog

src/lib/dhcp/iface_mgr.*
    IfaceMgr::isExternalSocket() - new function to facilitate UTs

src/lib/dhcp/tests/iface_mgr_unittest.cc
    Updated tests

[#3149] Fixed TLS error messages

[#3149] Removed link filter on relay/remote

[#3112] renamed getIOService to getInternalIOService

[#3112] renamed run_one and get_io_service to camelCase

[#3112] catch all exception when running IOService run, run_one and poll

[#3106] Extended a comment

As a result of a review.

[#3106] Fix network state for ha-sync-complete-notify

[#3128] fixed style

[#3128] updated hammer docs

[#3128] release checklist updated

[#3128] freeradius removed from hammer.py

[#3110] Post rebase corrections

[#3110] Fixed sloppy errors

[#3110] Addressed review comments

Reworked asyncSendLeaseUpdate() and made minor corrections

[#3110] Clean up and more tests

Added a ChangeLog entry

src/hooks/dhcp/high_availability/ha_impl.cc
    HAImpl::lease4ServerDecline() - always return NEXT_STEP_CONTINUE,
    and set peers_to_update argument.

src/hooks/dhcp/high_availability/ha_service.*
    Renamed HAService::asyncSendLeaseUpdate() to asyncSendSingleLeaseUpdate()

src/hooks/dhcp/high_availability/tests/ha_impl_unittest.cc
    TEST_F(HAImplTest, lease4ServerDecline) - new test

src/hooks/dhcp/high_availability/tests/ha_service_unittest.cc
    TEST_F(HAServiceTest, successfulSendSingleLeaseUpdateWithoutParking)
    TEST_F(HAServiceTest, successfulSendSingleLeaseUpdateWithParking) - new tests

doc/sphinx/arm/hooks-ping-check.rst
    Removed note about HA updates

doc/sphinx/arm/hooks.rst
    Updated ping-check description in table of hooks

doc/sphinx/arm/logging.rst
    Added ping-check-hooks logger to table of loggers

[#3110] HA decline updates working

Updates are working, need clean up and UTs in HA.

src/bin/dhcp4/dhcp4_hooks.dox
    Updated hooks dev guide

src/bin/dhcp4/dhcp4_srv.cc
    Added callout lease4_server_decline

    Dhcpv4Srv::serverDecline() - added lease4_server_decline hook point

src/bin/dhcp4/tests/hooks_unittest.cc
    TEST_F(HooksDhcpv4SrvTest, lease4OfferDiscoverDecline) - new test

src/hooks/dhcp/high_availability/ha_callouts.cc
    lease4_server_decline()  - new callout function

src/hooks/dhcp/high_availability/ha_impl.*
    HAImpl::lease4ServerDecline() - new callout handler

src/hooks/dhcp/high_availability/ha_messages.mes
    HA_LEASE4_SERVER_DECLINE_FAILED - new log

src/hooks/dhcp/high_availability/ha_service.*
    HAService::asyncSendLeaseUpdate() - new function for a single lease update
    HAService::asyncSendLeaseUpdates() - check parking lot null

[#3106] HA commands syntax fix

[#3106] Correct some API files

[#3106] Use MultiThreadingLock in NetworkState

[#3106] Fixed dhcp enable unit tests

[#3106] Convenience functions in HAService

[#3106] Corrected two messages' descriptions

[#3106] Use getThisServerName() in a few places

[#3106] Nits in ha_impl fixed

[#3106] Reworked network state functions

Removed reset() function and replaced it with resetForDbConnection().
Also, removed the enableAll() function and used other functions instead.

[#3106] Network state constants further apart

[#3106] Fixed some doxygen warnings

[#3106] Extended getConfig description

[#3106] Fixed logging placeholder in HA

[#3106] Fixes in the HA config parser

- renamed two functions
- removed redundant check
- better exception text

[#3106] Typos "a HA" to "an HA"

[#3106] Removed <> from HA commands

Per review comments from Razvan.

[#3106] Added test comments

[#3106] Update HA commands documentation

[#3106] ha-maintenance-notify includes server name

[#3106] Include origin in ha-sync-complete-notify

[#3106] Return default relationship

[#3106] Added local server name to log messages

[#3106] Added server-name to HA commands

[#3106] Renamed startService to startServices

[#3106] Network state change per HA service

[#3106] Validate configs between relationships

[#3106] Config to relationship mapper

[#3106] Allow multiple HA configs

[#3177] bump up configure.ac version to 2.5.5-git

[#3177] unrelated: update release checklist

[#3177] unrelated: delete leftover file

[#3174] release changes

[#3173] bump up library versions for 2.5.4 release

[#3109] added ChangeLog entry

[#3109] consistent pkt info logging in v4 and v6

[#2442] document order of RADIUS attributes

[#3139] Update Release Checklist

[#3084] fixed compilation

[#3084] fixed doxygen and comments

[#3084] More review comments

src/bin/dhcp4/dhcp4_messages.h b/src/bin/dhcp4/dhcp4_messages.*
    New messages
    DHCP4_SERVER_INITIATED_DECLINE_UPDATE_FAILED
    DHCP4_SERVER_INITIATED_DECLINE_ADD_FAILED
    DHCP4_SERVER_INITIATED_DECLINE_RESOURCE_BUSY

src/bin/dhcp4/dhcp4_srv.*
    Dhcpv4Srv::sendResponseNoThrow() - restored argument passing by ref
    Dhcpv4Srv::serverDecline() - use ResourceHandle, try add if update fails

[#3084] Addressed minor review comments

Fixed minor issues.

modified:
    src/bin/dhcp4/dhcp4_messages.mes
    src/bin/dhcp4/dhcp4_srv.cc
    src/bin/dhcp4/dhcp4_srv.h

[#3084] addressed review comments
- fixing mostly typos

[#3084] Minor ARM fixes

modified:   doc/sphinx/arm/hooks-ping-check.rst
modified:   doc/sphinx/arm/hooks.rst

[3084] Fix JSON in ARM

modified:   hooks-ping-check.rst

[#3084] Minor update to ARM

modified:   hooks-ping-check.rst

[#3084] Added initial ARM documentation

modified:   hooks-ping-check.rst

[#3084] Fixed missing log argument

modified:   dhcp4_srv.cc

[#3084] Remove unneeded response reset

src/bin/dhcp4/dhcp4_srv.cc

[#3084] Clean up

[#3084] Fix arguments going out of scope

Arguments passed to sendResponseNoThrow() via std::bind
can go out of scope before the invocation occurs.
Changed to pass-by-value.

src/bin/dhcp4/dhcp4_srv.*
    Dhcpv4Srv::sendResponseNoThrow() - changed arguments to
    pass by value instead of reference.

[#3084] Use callout argument instead of status

src/bin/dhcp4/dhcp4_messages.mes
    DHCP4_HOOK_LEASE4_OFFER_ARGUMENT_MISSING - new message

src/bin/dhcp4/dhcp4_srv.cc
    Dhcpv4Srv::processDhcp4Query() - look for offer-address-in-use
    argument in lease4_offer unpark lambda

[#3084] Fixed log placeholder error

modified:
    dhcp4_messages.cc
    dhcp4_messages.mes
    dhcp4_srv.cc

[#3084] Minor clean ups

src/bin/dhcp4/dhcp4_srv.cc

[#3084] Server declines leases after ping-check

kea-dhcp4 declines leases in the lease store
Needs additional UTs

src/bin/dhcp4/dhcp4_messages.mes
    New messages:
    DHCP4_SERVER_INITIATED_DECLINE_FAILED
    DHCP4_SERVER_INITIATED_DECLINE

src/bin/dhcp4/dhcp4_srv.*
    Dhcpv4Srv::serverDecline()
    Dhcpv4Srv::serverDeclineNoThrow() - new functions to render a lease declined
    after ping-check in-use outcome

    Dhcpv4Srv::processDhcp4Query() - modified unpark lambda to invoke
    serverDecline() following lease-offer completion if status is DROP

[#3142] fixed deadlock

[#2442] code-block without argument not allowed

Plus a few typo fixes.

[#2442] address review comments

[#2442] enable nitpicky in sphinx

To warn about all broken references. Also fixes the few broken
references found.

[#2442] add the old RADIUS doc back

[#2442] address review comments

[#2442] add ChangeLog entry

[#2442] docs: diff between old and new RADIUS libs

[#2442] add RADIUS server example to ARM

[#2442] RADIUS UML

[#2442] move RADIUS documentation to integrations

[#2442] update RADIUS documentation

[#1599] addressed comments

[#1599] optimizations

[#1599] addressed comments

[#1599] updated unittests

[#1599] added pause with wait for threads to stop

[#1599] implemented pause and resume

[#1599] optimizations

[#1599] fixed register/unregister thread in ThreadPoolQueue

[#1599] fixed race on wait and disable in ThreadPoolQueue

[#3142] fixed race between start stop and wait

[#3147] trivial hammer fix: don't move files

Don't move files to themselves.

Solves error: mv: 'kea-pkg/isc-kea-2.5.4-r20231113065823.apk' and
'kea-pkg/isc-kea-2.5.4-r20231113065823.apk' are the same file

[#2969] add tex-gyre back to hammer for debian

tex-gyre is needed for generating PDF with sphinx.

[#3138] fix typo in ARM doc for ddns-qualifying-suffix

[#2969] fix postgresql dependencies on rhel

[#2969] regenerate key to avoid SSL errors in DB

Prevents this error that happens on Debian 10:
- SSL error: Unable to get private key from '/etc/mysql/ssl/kea-server.key'

[#2969] fix a logging issue in hammer.py

Not all the lines of output were captured when running execute()
with capture=True.