Fix handling of EXECUTE with skip_metadata=false

patch by Aleksey Yeschenko and Jake Luciani; reviewed by Sylvain
Lebresne
Fix high memory use due to tracking reads on incrementally opened sstable readers

Patch by Jake Luciani; reviewed by Jason Brown for (CASSANDRA-8066)
Create backup directories for commitlog archiving during startup

patch by Jan Karlsson, reviewed by jasobrown for CASSANDRA-8111
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
ninja fix to add null check on CommitLogArchiver startup
Merge branch 'cassandra-2.0' into cassandra-2.1
Fix autocompletion for alter keyspace

patch by Rajanarayanan Thottuvaikkatumana; reviewed by Mikhail Stepura for CASSANDRA-8021
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
Validate ascii and utf8 string literals in cql queries

Patch by Tyler Hobbs; review by Aleksey Yeschenko for CASSANDRA-8101
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/transport/CBUtil.java
Avoid NPE when creating table w/ frozen sets, lists

Patch by Robert Stupp; reviewed by Tyler Hobbs for CASSANDRA-8104
Add the ability to cleanup files after CqlBulkRecordWriter succeeds

Patch by Paul Pak, reviewed by Piotr Kołaczkowski for CASSANDRA-7777
Merge branch 'cassandra-2.0' into cassandra-2.1
Gossip should ignore generation numbers too far in the future

patch by jasobrown; reviewed by driftx for CASSANDRA-8113
ninja-remove unneeded continue statement
Properly handle exceptions during native proto decode

Patch by Tyler Hobbs; reviewed by Aleksey Yeschenko for CASSANDRA-8118
Fix 2i lookup on collection cell names w/ some clustering columns

Patch by Tyler Hobbs; reviewed by Aleksey Yeschenko for CASSANDRA-8073
Ninja: add missing @Override to new toString() methods
Avoid NPE on null nested UDT inside a set

Patch by Robert Stupp; reviewed by Tyler Hobbs for CASSANDRA-8105
Committing revised 7927 for review