Merge r1581679 from branch-2. 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-2.4@1581682 13f79535-47bb-0310-9956-ffa450edef68