Add tab-completion to debian nodetool packaging
patch by Cyril Scetbon; reviewed by mshuler for CASSANDRA-6421
Fix potential ClassCastException in HintedHandoffManager

patch by slebresne; reviewed by benedict for CASSANDRA-7284
Backport first patch of 6975
Merge commit '362e54803434053fea25f874f64c69bdc1db78da' into cassandra-2.1
Use prepared statement internally

patch by slebresne; reviewed by mishail for CASSANDRA-6975