src/bin/dhcp4/json_config_parser.cc
    configureDhcp4Server() - added extract of configured globals

src/bin/dhcp4/tests/get_config_unittest.cc
src/bin/dhcp6/tests/get_config_unittest.cc
    Updated extracted and unparsed configs.

src/bin/dhcp6/json_config_parser.cc
    configureDhcp6Server() - added extract of configured globals

src/lib/dhcpsrv/srv_config.h
src/lib/dhcpsrv/srv_config.cc
    Added storage and maintence of configured globals
    SrvConfig::toElement() - added configured globals to result

src/lib/dhcpsrv/tests/srv_config_unittest.cc
    TEST_F(SrvConfigTest, configuredGlobals) - new test