Add basic tests for fqltool replay+compare
Add basic tests for fqltool replay+compare

Patch by marcuse; reviewed by Stefan Podkowinski for CASSANDRA-14690

iamaleksey/cassandra-dtest,pauloricardomg/cassandra-dtest,pcmanus/cassandra-dtest,stef1927/cassandra-dtest,iamaleksey/cassandra-dtest,aweisberg/cassandra-dtest,aweisberg/cassandra-dtest,blerer/cassandra-dtest,bdeggleston/cassandra-dtest,stef1927/cassandra-dtest,bdeggleston/cassandra-dtest,blerer/cassandra-dtest,pauloricardomg/cassandra-dtest