Recover from IOException in accept() thread
patch by Mihial Stepura; reviewed by jbellis for CASSANDRA-6349
Merge branch 'cassandra-2.0' into trunk
free off-heap IndexSummary during bulk load
patch by Tyler Hobbs; reviewed by jbellis for CASSANDRA-6359
Merge branch 'cassandra-2.0' into trunk
Cancel read meter task when closing SSTR
patch by Tyler Hobbs; reviewed by jbellis for CASSANDRA-6358
Merge branch 'cassandra-2.0' into trunk