Add dtests for compatibility flag introduced in CASSANDRA-13004 (#1485)
Add dtests for compatibility flag introduced in CASSANDRA-13004 (#1485)

Add dtests for compatibility flag introduced in CASSANDRA-13004
stef1927/cassandra-dtest,stef1927/cassandra-dtest,snazy/cassandra-dtest,riptano/cassandra-dtest,pcmanus/cassandra-dtest,pauloricardomg/cassandra-dtest,krummas/cassandra-dtest,iamaleksey/cassandra-dtest,aweisberg/cassandra-dtest,bdeggleston/cassandra-dtest,snazy/cassandra-dtest,spodkowinski/cassandra-dtest,beobal/cassandra-dtest,riptano/cassandra-dtest,blerer/cassandra-dtest,iamaleksey/cassandra-dtest,beobal/cassandra-dtest,aweisberg/cassandra-dtest,krummas/cassandra-dtest,blerer/cassandra-dtest,spodkowinski/cassandra-dtest,bdeggleston/cassandra-dtest,pauloricardomg/cassandra-dtest