Apply DONTNEED fadvise to commitlog segments
patch by Benedict Elliott Smith; reviewed by jbellis for CASSANDRA-6759
Merge branch 'cassandra-2.1' into trunk
Switch cqlsh from cassandra-dbapi2 to python-driver
patch by Mikhail Stepura for CASSANDRA-6307; reviewed by Aleksey Yeschenko and Tyler Hobbs
Merge branch 'cassandra-2.1' into trunk