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.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1479680 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-xxx-hadoop-auth-kerberos-realm-trunk-gd