YARN-628. Fix the way YarnRemoteException is being unrolled to extract out the underlying exception. Contributed by Siddharth Seth.
svn merge --ignore-ancestry -c 1483207 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1483208 13f79535-47bb-0310-9956-ffa450edef68