[master] Finished merge of trac5241 (always-send)

diff --cc ChangeLog
index 9dd31de1e080ba820c4bc0834ebd42d4d6255d0d,fe3a2f987943503e30c68f3d86f281430339ee05..70873acab5163c852764cdd31bb52621a32cc03f
--- 1/ChangeLog
--- 2/ChangeLog
+++ b/ChangeLog
@@@ -1,61 -1,3 +1,67 @@@
++1283. [func]          fdupont
++      An 'always-send' parameter has been added to options
++      configuration.  It allows an option to be always sent, even if
++      a client didn't request it.
++      (Trac #5241, git xxx)
++
 +1282. [bug]           fdupont
 +      Now all interface service sockets are closed before interface
 +      re-detection. Note if the re-configuration fails they remain
 +      closed.
 +      (Trac #5333, git xxx)
 +
 +1281. [build]         tmark
 +      Configure script now correctly recognizes static boost_system library as 
 +      well as checks for the presence of static glibc static libraries when
 +      --enable-satic-link is specified.
 +      (Trac #5337, git 42548148cbeaaa285519e121f493d52607f1e8a0)
 +
 +1280. [build]         waltsteverson
 +      Missing header for PD-exclude DHCPv6 option is now installed.
 +      (Github #51, git 36a8e1b8f687a6398af8a10f241e8d19e9de33d8)
 +
 +1279. [build]         waltsteverson
 +      Compilation fixes for Alpine Linux
 +      (Github #50, git 824afa63354e045a5e4f6437246c329d359e04dd)
 +
 +1278. [doc]           jsoref
 +      Many spelling corrections.
 +      (Github #52, git 1dcaef6f8e7901d628c8638fc2f8145ac0279586)
 +
 +1277. [func]*         marcin
 +      Added support to Command Manager to process commands using
 +      callouts implemented within hooks libraries.
 +      (Trac #5330, git 8041d177ed5587101ecb47a09820a7e67e42a066)
 +
 +1276. [build]         tmark
 +      The configure script now configures the build to require the Boost
 +      system library (boost_system) by default.  The library must be
 +      installed and you may need to specify "--with-boost-lib-dir=<path>".
 +      Prior to this the default was to attempt to build Boost with headers
 +      only.  Building with headers only may still be done, though it is
 +      strongly discouraged, by specifying "--enable-boost-headers-only".
 +      (Trac #5215, git b6f1ee0d1210e35631369fc697c76cc3cf2c4130)
 +
 +1275. [func]          marcin
 +      LibraryHandle object can now be used to register handlers
 +      for the control commands in a hook library.
 +      (Trac #5329, git 966cc24ae5593ebb08d6f02a11dab23463ebad7e)
 +
 +1274. [func]          marcin
 +      It is now possible to manage Control Agent with keactrl.
 +      (Trac #5108, git 53ba9f8197a25abd2c52ee3f5e95bc4e4be0241f)
 +
 +1273. [doc]           marcin
 +      Documented in the User's Guide that the server terminates
 +      when database connection is lost.
 +      (Trac #5320, git 5c8b277e8041b53b27a87b32d162ab41ef8b43d7)
 +
 +1272. [bug]           marcin
 +      Fixed inefficient leases indexing in the memfile lease
 +      manager causing increased CPU utilization during lease
 +      searches.
 +      (Trac #5328, git 23b490414f5575b252c8c42fbe93ad2c57d47953)
 +
  1271. [doc]           marcin
        Documented how to setup secure connection to the Kea
        control channel.

diff --cc doc/examples/kea4/multiple-options.json
Simple merge

diff --cc doc/examples/kea6/multiple-options.json
Simple merge

diff --cc src/bin/dhcp4/dhcp4_lexer.ll
Simple merge

diff --cc src/bin/dhcp4/dhcp4_parser.yy
Simple merge

diff --cc src/bin/dhcp4/dhcp4_srv.cc
Simple merge

diff --cc src/bin/dhcp4/tests/config_parser_unittest.cc
Simple merge

diff --cc src/bin/dhcp4/tests/dhcp4_srv_unittest.cc
Simple merge

diff --cc src/bin/dhcp4/tests/get_config_unittest.cc
Simple merge

diff --cc src/bin/dhcp6/dhcp6_lexer.ll
Simple merge

diff --cc src/bin/dhcp6/dhcp6_parser.yy
Simple merge

diff --cc src/bin/dhcp6/dhcp6_srv.cc
Simple merge

diff --cc src/bin/dhcp6/tests/get_config_unittest.cc
Simple merge

diff --cc src/lib/dhcpsrv/cfg_option.h
Simple merge

diff --cc src/lib/dhcpsrv/parsers/dhcp_parsers.cc
Simple merge

diff --cc src/lib/dhcpsrv/tests/dhcp_parsers_unittest.cc
Simple merge