Merge branch 'cassandra-2.1' into trunk
Fix LegacySSTableTest KS name
Use unsafe mutations where possible in unit tests

Patch by Lyuben Todorov; reviewed by Tyler Hobbs for CASSANDRA-6969
Fix race condition during pending range calculation

Patch by Josh McKenzie; reviewed by Tyler Hobbs for CASSANDRA-7390
Merge branch 'cassandra-2.1' into trunk

Conflicts:
	test/unit/org/apache/cassandra/db/CommitLogTest.java
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
Merge branch 'cassandra-2.1' into trunk
ninja fix comments in SharedExecutorPool
Merge branch 'cassandra-2.1.0' into cassandra-2.1