(cqlsh) COPY TO/FROM improvements

patch by Mikhail Stepura; reviewed by Tyler Hobbs for CASSANDRA-7405
Ninja: fixed cqlsh test (after 7d7d529)
Improve PasswordAuthenticator default super user setup

patch by Aleksey Yeschenko; reviewed by Jeremiah Jordan for
CASSANDRA-7788
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/auth/PasswordAuthenticator.java
Merge branch 'cassandra-2.0' into cassandra-2.1.0
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Validate empty cell names from counter updates

patch by Aleksey Yeschenko; reviewed by Jeremiah Jordan for
CASSANDRA-7798
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/cql3/Constants.java
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/cql3/Constants.java
	src/java/org/apache/cassandra/cql3/UpdateParameters.java
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Throw EOFException if we run out of chunks in compressed file

Patch by marcuse; reviewed by yukim for CASSANDRA-7664.
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Stop inheriting liveRatio and liveRatioComputedAt from previous memtables

patch by Aleksey Yeschenko; reviewed by Jonathan Ellis for CASSANDRA-7796
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/db/DataTracker.java
	src/java/org/apache/cassandra/db/Memtable.java
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Make StreamReceiveTask thread safe and gc friendly

patch by yukim; reviewed by benedict for CASSANDRA-7795
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/streaming/StreamReceiveTask.java
Merge branch 'cassandra-2.1.0' into cassandra-2.1