HBASE-8519  Backup master will never come up if primary master dies during initialization
            (Jerry He via JD)


git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1482986 13f79535-47bb-0310-9956-ffa450edef68
HBASE-5995 Fix and reenable TestLogRolling.testLogRollOnPipelineRestart

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1483006 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7006 [MTTR] Improve Region Server Recovery Time - Distributed Log Replay; ADDENDUM

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HBASE-8540 SnapshotFileCache logs too many times if snapshot dir doesn't exists

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HBASE-5930 Addendum with tests. (Davaraj)

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Merge remote branch 'origin/0.95' into 0.95-gd