Don't shut MessagingService down.

Patch by brandonwilliams, reviewed by Benedict for CASSANDRA-6948
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Move sstableRandomAccessReader to nio2
patch by Josh McKenzie; reviewed by Benedict Elliott Smith for CASSANDRA-4050
Avoid build failure due to ANTLR timeout

Patch by Ben Chan; reviewed by Tyler Hobbs for CASSANDRA-6991
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Fix NPE caused by CASSANDRA-6818

patch by yukim; reviewed by thobbs for CASSANDRA-6984
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Schedule schema pull in onChange.

Patch by brandonwilliams, reviewed by Russ Hatch for CASSANDRA-6971
Merge branch 'cassandra-1.2' into cassandra-2.0
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
fix broken build
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	src/java/org/apache/cassandra/service/StorageService.java
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Fix concurrency issue for CASSANDRA-6818

patch by yukim; reviewed by thobbs for CASSANDRA-7007
Merge branch 'cassandra-2.0' into cassandra-2.1