src/bin/dhcp4/json_config_parser.*
    databaseConfigConnect(const SrvConfigPtr& srv_cfg)
    databaseConfigFetch(const SrvConfigPtr& srv_cfg, ElementPtr /*global_scope*/)
    - new functions

    configureDhcp4Server() - modified to call databaseConfigFetch() after
    loading hook libs

src/bin/dhcp4/tests/config_parser_unittest.cc
    TEST_F(Dhcp4ParserTest, configControlInfoNoFactory) - new test
    TEST_F(Dhcp4ParserTest, configControlInfo) - modified to register
    dummy backend

src/lib/dhcpsrv/testutils/test_config_backend_dhcp4.*
    New files that implement DHPC4 dummy backend for testing