Expose global CF metrics

Patch by Chris Lohfink, reviewed by brandonwilliams for CASSANDRA-7273
Merge branch 'cassandra-1.2' into cassandra-2.0
Expose global CF metrics

Patch by Chris Lohfink, reviewed by brandonwilliams for CASSANDRA-7273
Fix CompositeType columns in DESCRIBE TABLE output

Patch by Mikhail Stepura; reviewed by Tyler Hobbs for CASSANDRA-7399
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
	bin/cqlsh
Fix replace_address after CASSANDRA-7356 broke it

Patch by Tyler Hobbs and Marcus Eriksson; reviewed by Brandon Williams for CASSANDRA-7356
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	src/java/org/apache/cassandra/config/DatabaseDescriptor.java
	src/java/org/apache/cassandra/service/StorageService.java
Update versions for 1.2.17 release
Fix CC#collectTimeOrderedData() tombstone optimisations

patch by Aleksey Yeschenko; reviewed by Jonathan Ellis for
CASSANDRA-7394
Support DISTINCT for static columns

This also fix the behaviour when DISTINCT is not used.

patch by slebresne; reviewed by thobbs for CASSANDRA-7305
Refuse range queries with strict bounds on compact tables

patch by slebresne; reviewed by iamaleksey for CASSANDRA-7059
Versions update for 2.0.9 release
Support Thrift tables clustering columns on CqlPagingInputFormat

patch by pauloricardomg; reviewed by alexliu68 for CASSANDRA-7445
Merge commit 'c9cef44a1a6c10036200f410c8a26942e64c8f12' into cassandra-2.0
Document initial_token/num_tokens behavior when both are set

Patch by Philip Thompson, reviewed by brandonwilliams for CASSANDRA-7411
Fix race in FileCacheService RemovalListener
patch by Sankalp Kohli; reviewed by jbellis for CASSANDRA-7278
Fix inconsistent use of consistencyForCommit that allowed LOCAL_QUORUM operations to incorrect become full QUORUM
patch by Sankalp Kohli; reviewed by jbellis for CASSANDRA-7345
Properly handle unrecognized opcodes and flags

Patch by Tyler Hobbs; reviewed by Sylvain Lebresne for CASSANDRA-7440
close CqlRecordWriter clients when finished
patch by Peter Williams; reviewed by jbellis for CASSANDRA-7459
Include high level sstables in lower level compactions if not compacted for a while.

Patch by marcuse, reviewed by kohlisankalp and yukim for CASSANDRA-7414