Disallow renaming columns one at a time when when the table don't have CQL3 metadata yet

patch by slebresne; reviewed by iamaleksey for CASSANDRA-5531
cqlsh: add CLUSTERING ORDER BY support to DESCRIBE

patch by Tyler Hobbs; reviewed by Aleksey Yeschenko for CASSANDRA-5528
Merge branch 'cassandra-1.2' into trunk

Conflicts:
	bin/cqlsh
	src/java/org/apache/cassandra/cql3/statements/AlterTableStatement.java