Fix unintended update with conditional statement

patch by slebresne; reviewed by iamaleksey for CASSANDRA-6893
Replace equals by type compare
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	src/java/org/apache/cassandra/cql3/ColumnCondition.java
Don't shut ExpiringMap down.

Patch by Benedict, reviewed by brandonwilliams for CASSANDRA-6948
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
Fix collection element access in IF

patch by slebresne; reviewed by thobbs for CASSANDRA-6914
Handle short slice start/finishes of different lengths

Patch by Tyler Hobbs; reviewed by Sylvain Lebresne as a follow-up for
CASSANDRA-6825
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	src/java/org/apache/cassandra/cql3/ColumnCondition.java
Allow compaction of system tables during startup
patch by Benedict Elliott Smith; reviewed by jbellis for CASSANDRA-6913
merge from 2.0
add asserts to make sure we don't call KS.open during startup
patch by Benedict Elliott Smith; reviewed by jbellis
Revert "Don't shut ExpiringMap down."

This reverts commit d4ec31f21eb83502bd523c057bce2d3b249b3d80.

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	src/java/org/apache/cassandra/db/marshal/CompositeType.java
	test/unit/org/apache/cassandra/db/marshal/CompositeTypeTest.java
Merge branch 'cassandra-2.0' into cassandra-2.1
Handle short slice start/finishes of different lengths

Patch by Tyler Hobbs; reviewed by Sylvain Lebresne as a follow-up for
CASSANDRA-6825
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	src/java/org/apache/cassandra/db/marshal/CompositeType.java
	test/unit/org/apache/cassandra/db/marshal/CompositeTypeTest.java
Skip range calculations for range slices on LocalStrategy keyspaces

Patch by Tyler Hobbs; reviewed by Jonathan Ellis for CASSANDRA-6906
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	src/java/org/apache/cassandra/service/StorageProxy.java
Add logging about not autobootstrapping a seed.

Patch by brandonwilliams for CASSANDRA-6972
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	src/java/org/apache/cassandra/service/StorageService.java