YARN-1307. Redesign znode structure for Zookeeper based RM state-store for better organization and scalability. Contributed by Tsuyoshi OZAWA.
svn merge --ignore-ancestry -c 1552209 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1552210 13f79535-47bb-0310-9956-ffa450edef68