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This reverts commit 7f62f7f1.
This is already covered in #5145.

src/bin/dhcp4/json_config_parser.cc
    createGlobalDhcp4ConfigParser()
    - added clause to invoke new D2ClientConfigParser to
    set staging config
    - added clause to apply staged D2ClientConfig (formerly done
    by parser commit

src/bin/dhcp4/parser_context.h
src/bin/dhcp4/parser_context.cc
    aded PARSER_DHCP_DDNS context

src/bin/dhcp4/simple_parser4.h
src/bin/dhcp4/simple_parser4.cc
    defined SimpleParser4::D2_CLIENT_CONFIG_DEFAULTS
    SimpleParser4::setAllDefaults() - now sets defaults
    for D2ClientConfig

src/bin/dhcp4/tests/d2_unittest.cc
src/bin/dhcp4/tests/fqdn_unittest.cc
    Updated replace-name-mode values (true/false no longer supported)

src/lib/dhcpsrv/parsers/dhcp_parsers.h
src/lib/dhcpsrv/parsers/dhcp_parsers.cc
    D2ClientConfig now derives from SimpleParser

src/lib/dhcpsrv/srv_config.h
src/lib/dhcpsrv/srv_config.cc
    Added a D2ClientConfigPtr member to SrvConfig.

src/lib/dhcpsrv/tests/dhcp_parsers_unittest.cc
    Updated tests to set D2 client config defaults

doc/guide/dhcp4-srv.xml
    Updated, replace-client-name no longer accepts booleans

This change was suggested during a ticket review.

Addressed a couple of minor issues and added unit tests for
switching between various lease database backends.

In such case, the server will use a default configuration - memfile
lease database backend.

This reverts commit 8f2a1f8a, reversing
changes made to ed7edadc.

This  merge introduced regressions in our build farm and revealed
issues in the DHCP4o6 IPC code. It also revealed some differences
in sockets handling under Linux and BSD. Rather than continue
patching this here, we should work on the branch to resolve all
issues and then merge 1.1.

src/lib/dhcpsrv/parsers/client_class_def_parser.cc
    ClientClassDefListParser::commit() - pushes the newly built local
    dictionary to CfgMgr staging

src/lib/dhcpsrv/srv_config.h
src/lib/dhcpsrv/srv_config.cc
    Added client class dictionary member to SrvConfig

src/lib/dhcpsrv/tests/client_class_def_parser_unittest.cc
    TEST_F(ClientClassDefListParserTest, simpleValidList) - now
    verifies that ClientClassDefListParser::commit() pushes its
    local dictionary to CfgMgr staging.

src/lib/dhcpsrv/tests/srv_config_unittest.cc
    Added support to test new client class dictionary member

 - commitGlobalParameters renamed to setGlobalParameters
 - const added
 - Comments updated

Using the v4 changes as a guide (3798) add statistics
for subnets for v6.  The four stats are total addresses
and addresses used for both NA and PD.

 - {update,remove}Statistics moved from CfgMgr to SrvConfig,CfgSubnets4

 - Moved MAC operations to a new CfgMACSource class
 - Moved macros to HWaddr class
 - Added several unit-tests for MAC sources
 - MAC extraction code moved to separate function in Dhcpv6Srv

The modifications to the staging configuration are performed on the pointer
returned by getCfgOptionDef.