cli: Add JMX authentication support

Patch by Michał Michalski; reviewed by Aleksey Yeschenko for
CASSANDRA-5080
Merge branch 'cassandra-1.1' into cassandra-1.2

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-1.2' into trunk
Fix forceBlockingFlush behavior

patch by krummas; reviewed by slebresne for CASSANDRA-5241
Merge branch 'cassandra-1.2' into trunk

Conflicts:
	src/java/org/apache/cassandra/db/ColumnFamilyStore.java
Fix pessimistic unit tests post-4671
remove dead code (unused assignments)
Merge branch 'cassandra-1.2' into trunk