YARN-629. Make YarnRemoteException not be rooted at IOException. Contributed by Xuan Gong.
MAPREDUCE-5204. Handling YarnRemoteException separately from IOException in MR app after YARN-629. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1479680 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1479684 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-9046-branch-2-gd