YARN-631. Changed ClientRMProtocol api to throw IOException and YarnRemoteException. Contributed by Xuan Gong.
MAPREDUCE-5212. Handling YarnRemoteException separately from IOException in MR App after YARN-631. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1480494 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480495 13f79535-47bb-0310-9956-ffa450edef68