YARN-1239. Modified ResourceManager state-store implementations to start storing version numbers. Contributed by Jian He.
svn merge --ignore-ancestry -c 1546229 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1546230 13f79535-47bb-0310-9956-ffa450edef68