HBASE-8928: Make ChaosMonkey & LoadTest tools extensible (Gautam Soni)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1504602 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8847 Filter.transform() always applies unconditionally, even when combined in a FilterList (Christophe Taton)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1504631 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8988 Reuse the thread pool in the shell to not run out of threads (Jean-Daniel Cryans)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1504659 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8599 HLogs in ZK are not cleaned up when replication lag is minimal (Varun Sharma)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1504665 13f79535-47bb-0310-9956-ffa450edef68