Support multi-row selects within a partition using IN

Patch by Tyler Hobbs; review by Sylvain Lebresne for CASSANDRA-6875
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/cql3/Cql.g
	src/java/org/apache/cassandra/cql3/Lists.java
	src/java/org/apache/cassandra/cql3/QueryProcessor.java
	src/java/org/apache/cassandra/cql3/Relation.java
	src/java/org/apache/cassandra/cql3/ResultSet.java
	src/java/org/apache/cassandra/cql3/statements/BatchStatement.java
	src/java/org/apache/cassandra/cql3/statements/ModificationStatement.java
	src/java/org/apache/cassandra/cql3/statements/Restriction.java
	src/java/org/apache/cassandra/cql3/statements/SelectStatement.java
Merge branch 'cassandra-2.1' into trunk
Fix broken paging state with prepared statement

patch by slebresne; reviewed by thobbs for CASSANDRA-7120
Remove bogus validation post-6855
Fix IllegalArgumentException in CqlStorage

patch by slebresne; reviewed by driftx for CASSANDRA-7287
Fix broken paging state with prepared statement

patch by slebresne; reviewed by thobbs for CASSANDRA-7120
Merge branch 'cassandra-2.1' into trunk

Conflicts:
	CHANGES.txt
Bump CQL version to 3.1.7, update CQL docs

Follow up for CASSANDRA-6875
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Support nul/non-existant fields in UDT

patch by slebresne; reviewed by iamaleskey for CASSANDRA-7206
Correctly name FileCache metrics.

Patch by Nick Bailey, reviewed by brandonwilliams for CASSANDRA-7294
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Bump cqlsh default CQL version to 3.1.7

Follow up for CASSANDRA-6875
Merge branch 'cassandra-2.1' into trunk
fix merge-created bad map key lookup type
Merge branch 'cassandra-2.1' into trunk
fix countAllBatches query
patch by Lyuben Todorov; reviewed by jbellis for CASSANDRA-7300