Remove cassandra-cli

patch by Aleksey Yeschenko; reviewed by Brandon Williams and Jason Brown
for CASSANDRA-7920
Support many sstables to be passed into sstablerepairedset

Patch by carlyeks; reviewed by marcuse for CASSANDRA-7995
Merge branch 'cassandra-2.1' into trunk

Conflicts:
	src/java/org/apache/cassandra/tools/SSTableRepairedAtSetter.java
Merge remote-tracking branch 'origin/trunk' into 7396-coll-slice