YARN-321. Relocating CHANGES.txt for the entries corresponding to YARN-321 branch for minimizing conflicts.
svn merge --ignore-ancestry -c 1557889 ../YARN-321


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1562211 13f79535-47bb-0310-9956-ffa450edef68