Fix SSTable not released if stream session fails

patch by yukim; reviewed by Richard Low for CASSANDRA-6818
if relocate is a no-op, don't try to op.
Merge branch 'cassandra-1.2' into cassandra-2.0
Revert "Fix LatencyMetrics returning infinity."

This reverts commit 5e51aa4e6d1d868bb82a1aa2ffaed4613b24ffc1.
getRecentLatency returns zero instead of infinity

Patch by Benedict, reviewed by brandonwilliams for CASSANDRA-6920
Don't shut MessagingService down.

Patch by brandonwilliams, reviewed by Benedict for CASSANDRA-6948
Avoid build failure due to ANTLR timeout

Patch by Ben Chan; reviewed by Tyler Hobbs for CASSANDRA-6991
Fix NPE caused by CASSANDRA-6818

patch by yukim; reviewed by thobbs for CASSANDRA-6984
Schedule schema pull in onChange.

Patch by brandonwilliams, reviewed by Russ Hatch for CASSANDRA-6971
Merge branch 'cassandra-1.2' into cassandra-2.0
fix broken build
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	src/java/org/apache/cassandra/service/StorageService.java
Fix concurrency issue for CASSANDRA-6818

patch by yukim; reviewed by thobbs for CASSANDRA-7007
Put nodes into hibernate when join_ring is false.

Patch by brandonwilliams, reviewed by Tyler Hobbs for CASSANDRA-6961
Update changes
Non-droppable verbs shouldn't be dropped from OTC

patch by jasobrown; reviewed by Richard Low for CASSANDRA-6980
Merge remote-tracking branch 'apache/cassandra-1.2' into cassandra-2.0
Shutdown batchlog executor in SS#drain()

patch by Sergio Bossa; reviewed by Aleksey Yeschenko for CASSANDRA-7025
Merge branch 'cassandra-1.2' into cassandra-2.0
Fix ticket number in CHANGES