Merge r1581678 from trunk. YARN-1521. Mark Idempotent/AtMostOnce annotations to the APIs in ApplicationClientProtcol, ResourceManagerAdministrationProtocol and ResourceTrackerProtocol so that they work in HA scenario. Contributed by Xuan Gong

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1581679 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5910: Merging r1581688 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1581690 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10439. Fix compilation error in branch-2 after HADOOP-10426. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1581721 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6130. Merge r1581713 from trunk.

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