YARN-1686. Fixed NodeManager to properly handle any errors during re-registration after a RESYNC and thus avoid hanging. Contributed by Rohith Sharma.
svn merge --ignore-ancestry -c 1571474 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1571475 13f79535-47bb-0310-9956-ffa450edef68