Make LCS split compaction results over many directories

Patch by marcuse; reviewed by yukim for CASSANDRA-8329
Validate size of indexed column values

patch by Sam Tunnicliffe; reviewed by Aleksey Yeschenko for
CASSANDRA-8280
Ignore Paxos commits for truncated tables

patch by Sam Tunnicliffe; reviewed by Aleksey Yeschenko for
CASSANDRA-7538
Add DC-aware sequential repair

patch by Jimmy Mårdell; reviewed by yukim for CASSANDRA-8193
Backport CASSANDRA-7386
Expose off-heap memory usage stats

patch by Benjamin Lerer; reviewed by Aleksey Yeschenko for
CASSANDRA-7897
Increase quarantine on replacement

Patch by brandonwilliams, reviewed by jasobrown for CASSANDRA-8260
Ninja-add missing consistency levels to cqlsh
Fix undeclared throwable exception while executing 'nodetool netstats localhost'

Patch by Vishal Mehta and Carl Yeksigian, reviewed by Carl Yeksigian for
CASSANDRA-8122
don't block SocketThread for MessagingService

Patch by yangwei, reviewed by brandonwilliams for CASSANDRA-8188
cancel latency-sampling task when CF is dropped
patch by jbellis; reviewed by ayeschenko for CASSANDRA-8401