src/lib/dhcpsrv/host_data_source_factory.cc
    HostDataSourceFactory::create() - now instantiates PgSqlHostDataSource

src/lib/dhcpsrv/pgsql_host_data_source.cc
    Enabled basic IPv4 host statements and methods

src/lib/dhcpsrv/tests
    New file: pgsql_host_data_source_unittest.cc

src/lib/dhcpsrv/tests/Makefile.am
    Added pgsql_host_data_source_unittest.cc