GitLab

    src/bin/dhcp6/json_config_parser.cc
        createGlobalDhcp6ConfigParser()
        - added clause to invoke new D2ClientConfigParser to
        set staging config
        - added clause to apply staged D2ClientConfig (formerly done
        by parser commit

    src/bin/dhcp6/parser_context.h
    src/bin/dhcp6/parser_context.cc
        aded PARSER_DHCP_DDNS context

    src/bin/dhcp4/simple_parser6.h
    src/bin/dhcp4/simple_parser6.cc
        defined SimpleParser6::D2_CLIENT_CONFIG_DEFAULTS
        SimpleParser6::setAllDefaults() - now sets defaults
        for D2ClientConfig

    src/bin/dhcp6/tests/d2_unittest.cc
    src/bin/dhcp6/tests/fqdn_unittest.cc
        Updated replace-name-mode values and tests
        (true/false no longer supported)

    doc/guide/dhcp6-srv.xml
        Updated, replace-client-name no longer accepts booleans

 - The parsers converted to SimpleParser
 - Unit-tests updated, cleaned up and corrected
 - Updated examples to actually use the information
 - Updated User's Guide that the empty mac-sources is not allowed

Added memfile without persistence to set_config unit tests. This eliminates
the tests attempting to create the csv file.

Updated copyrights.

Fixed misspelling.

src/lib/config/command_mgr.cc
    CommandMgr::commandReader(int sockfd) - duplicates the connection
    socket to use for repsonding in case the command closes the channel.

src/lib/testutils/io_utils.cc
    fileExists() - now uses stat() function so one can use it on any
    type of file, like a unix socket

updated unit tests accordingly

 - address_family_, default ctor removed from two parsers
 - copyright year updated
 - Element::getNonConst is now documented
 - user's guide is now clear about csv-format default value is now true