[#3210] fix some warnings

[#3210] clean up some header includes

[#3210] update copyright dates

[#3210] miscellaneous warning fixes in lib/util

- Wsign-compare
- Wshadow
- doxygen warnings
- fix compilation for src/lib/util/tests/Makefile.am

[#3210] refactor string utilities

- Rename util/strutil.h to util/str.h to escape redundancy.
- Simplify trim function.
- Remove unused functions.
- Get rid of the regex conditional compilation that helped Kea build
  with ancient compilers. Lack of proper regex functionality now results
  in failure in configure.ac.

[#3210] refactor io utilities

- Rename util/io_utilities.h to util/io.h to escape redundancy.
- Create readUint and writeUint templates.
- Use reverse_copy for potential performance boost.
- Add missing unit tests.

[#3210] refactor file utilities

- Unify filename.h and file_utilities.h under filesystem.h.
- Rename Filename class to Path since it more accurately represents
  it.
- Make its interface as close as possible to that of std::filesystem::path.
- Remove unused method expandWithDefault.
- Rename useAsDefault to replaceExtension since it was only used in the
  purpose of replacing extension.
- Unroll the split method in the constructor.

[#3210] properly match header names with regex

[#3210] add ability to format changed files

[#3267] cosmetic changes to find headers script

[#3267] add EXCLUDE_LIST in find headers script

[#3267] fix find header script not finding files

Script did not find files that are on the same line as the _HEADERS
variable.

[#3267] cosmetic changes to find headers script

[#3267] add tools/find-uninstalled-headers.py

[#3267] added ChangeLog entry

[#3267] unify tabs

[#3267] add missing include_HEADERS

- missing headers in libkea-util
- missing headers in libkea-util-io

[#3267] add missing include_HEADERS

- missing headers in libkea-dhcpsrv

[#3267] add missing include_HEADERS

- missing headers in libkea-d2srv

[#3267] add missing include_HEADERS

- missing headers in libkea-cfgclient

[#3267] add missing include_HEADERS

[#3262] reword RADIUS doc

[#2692] Addressed comments

[#2692] Added a ChangeLog entry

[#2692] Added unit tests

[#2692] Checkpoint: code done, need UT

[#3212] restore code after rebase

[#3212] reformat UT file

[#3212] doxygen docs fixes

[#3212] restore UTs

[#3212] remove redundant specifier

[#3212] reorder namespaces

[#3212] update includes

[#3212] code reformat

[#3212] NULLs refactor

- introduce 0 instead of NULL

[#3212] refactor function name

- introduce camelCase name

[#3212] refactor time utils

Step 2: implement time utils in lib dns

[#3212] refactor time utils

Step 1: remove from lib/utils

[#3249] hammer fix

 - hammer supported-systems works again

[#3211] Renamed getDataAsVP

[#3211] Removed remaining InvalidBufferPosition

[#3211] Replaced InvalidBufferPosition exception by OutOfRange

[#3211] More cosmetic changes (3)

[#3211] More cosmetic changes (2)

[#3211] More cosmetic changes

[#3211] More new getVector use cases

[#3211] Almost done

[#3211] Checkpoint: rewrote InputBuffer

[#3253] addresed review

[#3253] Renamed end_event to stop_event

src/hooks/dhcp/perfmon/alarm.*
src/hooks/dhcp/perfmon/monitored_duration.*
src/hooks/dhcp/perfmon/tests/alarm_unittests.cc
src/hooks/dhcp/perfmon/tests/monitored_duration_unittests.cc
    - renamed DurationKey::end_event_ to DurationKey::stop_event_

[#3253] Added report due time finders

src/hooks/dhcp/perfmon/monitored_duration.*
    MonitoredDuration::getCurrentIntervalStart()
    MonitoredDuration::expireCurrentInterval() - new functions

src/hooks/dhcp/perfmon/monitored_duration_store.*
    MonitoredDurationStore::getReportsNext()
    MonitoredDurationStore::getOverdueReports() - new functions

src/hooks/dhcp/perfmon/tests/monitored_duration_store_unittests.cc
    TEST_F(MonitoredDurationStoreTest, reportDue*) - new tests

src/hooks/dhcp/perfmon/tests/monitored_duration_unittests.cc
    TEST(MonitoredDuration, expireInterval) - new test

src/lib/dhcp/pkt.h
    static boost::posix_time::ptime& MIN_TIME()
    static boost::posix_time::ptime& MAX_TIME() - new functions

[#3253] Use modify() to do inplace updates

src/hooks/dhcp/perfmon/alarm_store.cc
    AlarmStore::checkDurationSample() - revamped to use multi_index::modify

src/hooks/dhcp/perfmon/monitored_duration_store.*
    MonitoredDurationStore::addDurationSample() - revamped to use multi_index::modify
    Added index on current interval start time

src/hooks/dhcp/perfmon/tests/monitored_duration_store_unittests.cc
    Took out speed check UTs, left function

[#3253] fixed returns with no space

modified:
    src/hooks/dhcp/perfmon/alarm_store.cc
    src/hooks/dhcp/perfmon/monitored_duration_store.cc

[#3253] Doxygen clean up

../../../../doc/devel/Doxyfile
    Added perfmon dir

modified:
    alarm.h
    alarm_store.h
    monitored_duration_store.h

[#3253] Added In-place alarm checking

src/hooks/dhcp/perfmon/alarm_store.*
    AlarmStore::checkDurationSample() - new function to check a sample
    against an alarm in-place

src/hooks/dhcp/perfmon/tests/alarm_store_unittests.cc
    checkDurationSampleTest(uint16_t family)  - new test function and tests

[#3253] Added in-place duration update

src/hooks/dhcp/perfmon/monitored_duration.*
    MonitoredDuration::MonitoredDuration() - new copy ctor
    DurationDataInterval::operator==() - added for UTs

src/hooks/dhcp/perfmon/monitored_duration_store.*
    MonitoredDurationStore::addDurationSample()
    - new function for adding sample to duration in-place
    MonitoredDurationStore::addDuration()
    - removed optional sample parameter

src/hooks/dhcp/perfmon/tests/monitored_duration_store_unittests.cc
    addDurationSampleTest(uint16_t family)  - new test func and tests

src/hooks/dhcp/perfmon/tests/monitored_duration_unittests.cc
    TEST(MonitoredDuration, copyConstructors) - new test

[#3253] Added AlarmStore classes

src/hooks/dhcp/perfmon/alarm_store.h
src/hooks/dhcp/perfmon/alarm_store.cc
src/hooks/dhcp/perfmon/testsalarm_store_unittests.cc
    new files

src/hooks/dhcp/perfmon/Makefile.am
   Added alarm_store.cc and alarm_store.h

[#3253] Minor cleanup

modified:
   monitored_duration_store.cc
   monitored_duration_store.h

[3253] Removed clutter

modified:   monitored_duration_store.h

[#3253] Full CRUD for MonitoredDurationStore

MonitoredDurationStore implements CRUD for primay
key index, along with UTs.

[#3253] Initial commit of MontioredDurationStore

Initial implemention of MonitoredDurationStore and UTs

src/hooks/dhcp/perfmon/tests/monitored_duration_store_unittests.cc
src/hooks/dhcp/perfmon/monitored_duration_store.cc
src/hooks/dhcp/perfmon/monitored_duration_store.h
    new files

src/hooks/dhcp/perfmon/Makefile.am
    added monitored_duration_store.cc monitored_duration_store.h

src/hooks/dhcp/perfmon/monitored_duration.*
    Added  ==, !=, < operators

src/hooks/dhcp/perfmon/tests/Makefile.am
    added monitored_duration_store_unittests.cc

src/hooks/dhcp/perfmon/tests/monitored_duration_unittests.cc
    TEST(DurationKey, equalityOperators) - new test

[#3262] Optimized getSubnet() (#3268 1st point)

[#3262] check parking limit on subnet select

[#3262] on completion callback for subnet select

[#3262] document RADIUS thread-pool-size

[#3280] Added performance.dox to Makefile.am

modified:   doc/devel/Makefile.am

[#3280] Updated Doxyfile

Ran "doxygen -u" with doxygen 1.10.0 to update our Doxyfile
Cleared up several warnings and eliminated dot errors in crypto lib.

[#3280] Fixed a few more

Fixed errors that should have been reported but
do not under doxygen 1.8.17

modified:
../../src/bin/dhcp4/dhcp4_srv.h
../../src/lib/dhcp/pkt.h

[#3280] Fixed new errors after rebase

src/lib/dns/char_string.h
src/lib/dns/txt_like.h

[#3280] Fixed typos

[#3280] Fix performance hierarchy

modified:
    mainpage.dox
    performance.dox

[#3280] Added stub Performance page

Performance subpage was missing.  Added with simple content.

[#3280] Fixed doxygen commentary errors

Removed failing references to private class members,
Added missing paramters
miscellaneous other errors

[#3285] Removed GENERATE code and tests

[#3208] reordered includes

[#3208] Removed define 1 in include guards

[#3208] Revamped registry UTs

[#3208] Restore CH A RR

[#3208] Removed spurious tabs and spaces

[#3208] Got rid of non-C++ NULL

[#3208] fix Makefile

[#3208] clean up code

[#3208] added not implemented types

[#3208] restore unittests

[#3208] remove unused code in libdns

[#3270] Make Perfmon addSampleAndClear UT reliable

src/hooks/dhcp/perfmon/tests/monitored_duration_unittests.cc
    TEST(MonitoredDuration, addSampleAndClear) - reworked to remove
    timing sensitivity

[#3190] addressed review comments

[#3190] fixed ASAN warnings

[#3190] fix ASAN warnings

[#3190] use smart pointer to capture IOService instance

[#3271] bump version in configure.ac to 2.5.7

[#3263] release changes

[#3263] release changes

[#3261] bump up library versions for 2.5.6 release

[#3193] fixed double free when using botan

[#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