YARN-714. Added NMTokens to be sent to AMs as part of heart-beat response. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1487704 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1487705 13f79535-47bb-0310-9956-ffa450edef68