HBASE-12742

Signed-off-by: stack <stack@apache.org>
HBASE-12750 getRequestsCount() in ClusterStatus returns total number of request (Weichen Ye)
HBASE-12736

Signed-off-by: stack <stack@apache.org>
HBASE-12739 Avoid too large identifier of ZooKeeperWatcher (Liu Shaohui)
HBASE-12735 Refactor TestAcidGuarantees so it can live as unit test and as an integration test
HBASE-12590 A solution for data skew in HBase-Mapreduce jobs (Weichen Ye)
HBASE-12749 Tighten HFileLink api to enable non-snapshot uses
Merge remote-tracking branch 'upstream/master' into hbase-11144