Adding shuffle step when upgrading to versions greater than or equal 1.2 and when vnodes are enabled
Adding shuffle step when upgrading to versions greater than or equal 1.2 and when vnodes are enabled

snazy/cassandra-dtest,stef1927/cassandra-dtest,stef1927/cassandra-dtest,pauloricardomg/cassandra-dtest,riptano/cassandra-dtest,pauloricardomg/cassandra-dtest,mambocab/cassandra-dtest,aweisberg/cassandra-dtest,beobal/cassandra-dtest,snazy/cassandra-dtest,riptano/cassandra-dtest,carlyeks/cassandra-dtest,thobbs/cassandra-dtest,aweisberg/cassandra-dtest,bdeggleston/cassandra-dtest,mambocab/cassandra-dtest,beobal/cassandra-dtest,spodkowinski/cassandra-dtest,spodkowinski/cassandra-dtest,josh-mckenzie/cassandra-dtest,carlyeks/cassandra-dtest,pcmanus/cassandra-dtest,blerer/cassandra-dtest,bdeggleston/cassandra-dtest,iamaleksey/cassandra-dtest,iamaleksey/cassandra-dtest,yukim/cassandra-dtest,krummas/cassandra-dtest,krummas/cassandra-dtest,tjake/cassandra-dtest,thobbs/cassandra-dtest,blerer/cassandra-dtest