HBASE-8764 Some MasterMonitorCallable should retry

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HBASE-8439 [replication] Remove ReplicationZookeeper class

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HBASE-9044 Merging regions throws NPE

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1507501 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9048 HCM throws NullPointerException under load

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Merge remote branch 'origin/0.95' into 0.95-gd
Merge remote branch 'origin/0.95-gd' into fb-YAHOO-313-0.95-gd