src/lib/dhcpsrv/mysql_host_data_source.cc
    MySqlHostExchange::createBindForSend() - removed extraneous buffer length
    assignment for client class text.

src/lib/dhcpsrv/tests/generic_host_data_source_unittest.cc
    - Added implementations for:
        GenericHostDataSourceTest::compareClientClasses()
        GenericHostDataSourceTest::testMultipleClientClasses4()
        GenericHostDataSourceTest::testMultipleClientClasses6()
        GenericHostDataSourceTest::testMultipleClientClassesBoth()

src/lib/dhcpsrv/tests/mysql_host_data_source_unittest.cc
    - Added implementations for:
        TEST_F(MySqlHostDataSourceTest, multipleClientClasses4)
        TEST_F(MySqlHostDataSourceTest, multipleClientClasses6)
        TEST_F(MySqlHostDataSourceTest, multipleClientClassesBoth)

src/lib/dhcpsrv/tests/pgsql_host_data_source_unittest.cc
    - Added implementations for:
        TEST_F(PgSqlHostDataSourceTest, multipleClientClasses4) {
        TEST_F(PgSqlHostDataSourceTest, multipleClientClasses6) {
        TEST_F(PgSqlHostDataSourceTest, multipleClientClassesBoth) {