src/lib/dhcpsrv/network.*
    Network - added DDNS parameters: Optional members, getters, setters
    Network::toElement() - added DDNS parameters

src/lib/dhcpsrv/parsers/base_network_parser.*
    BaseNetworkParser::parseDdnsParams() - new method to parse DDNS parameters

    BaseNetworkParser::parseLifetime() - fixed unitialized variables warning

src/lib/dhcpsrv/parsers/dhcp_parsers.cc
    Subnet4ConfigParser::initSubnet()
    Subnet6ConfigParser::initSubnet()  - added call to parseDdnsParms().

src/lib/dhcpsrv/parsers/shared_network_parser.cc
    SharedNetwork4Parser::parse()
    SharedNetwork6Parser::parse() - added call to parseDdnsParms().

src/lib/dhcpsrv/parsers/simple_parser4.cc
    SimpleParser4::GLOBAL4_PARAMETERS
    SimpleParser4::GLOBAL4_DEFAULTS
    SimpleParser4::SUBNET4_PARAMETERS
    SimpleParser4::INHERIT_TO_SUBNET4
    SimpleParser4::SHARED_NETWORK4_PARAMETERS - added DDNS parameters

src/lib/dhcpsrv/parsers/simple_parser6.cc
    SimpleParser6::GLOBAL6_PARAMETERS
    SimpleParser6::GLOBAL6_DEFAULTS
    SimpleParser6::SUBNET6_PARAMETERS
    SimpleParser6::INHERIT_TO_SUBNET6
    SimpleParser6::SHARED_NETWORK6_PARAMETERS - added DDNS parameters

src/lib/dhcpsrv/tests/cfg_shared_networks4_unittest.cc
src/lib/dhcpsrv/tests/cfg_shared_networks6_unittest.cc
src/lib/dhcpsrv/tests/dhcp_parsers_unittest.cc
src/lib/dhcpsrv/tests/network_unittest.cc
src/lib/dhcpsrv/tests/shared_network_parser_unittest.cc
src/lib/dhcpsrv/tests/shared_network_unittest.cc
src/lib/dhcpsrv/tests/subnet_unittest.cc
    Updated tests.