(Hadoop) fix cluster initialisation for a split fetching

patch by Jacek Lewandowski; reviewed by Alex Liu for CASSANDRA-7774
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.0' into cassandra-2.1.0
Merge branch 'cassandra-2.1.0' into cassandra-2.1