Fix cql3 reader when columns is reversed.

Patch by Alex Liu, reviewed by pkolackzk for CASSANDRA-7100
Merge branch 'cassandra-2.0' into cassandra-2.1
Fix ConfigHelper.setInputColumnFamily with uppercased keyspace names.

Patch by Alex Liu, reviewed by pkolackzk for CASSANDRA-7093
Merge branch 'cassandra-2.0' into cassandra-2.1