r/m unused code from ThriftServer/TServerFactory
patch by Ed Capriolo; reviewed by jbellis for CASSANDRA-6854
ByteBuffer write() methods for serializing sstables

Patch by benedict, reviewed by marcuse for CASSANDRA-6781
comment CqlRow for #6807
Merge branch 'cassandra-1.2' into cassandra-2.0
Merge remote-tracking branch 'origin/cassandra-2.1' into cassandra-2.1
Merge branch 'cassandra-2.0' into cassandra-2.1