Merge r1618915 from trunk. YARN-2409. RM ActiveToStandBy transition missing stoping previous rmDispatcher. Contributed by Rohith

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618916 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10968. hadoop native build fails to detect java_libarch on ppc64le (Dinar Valeev via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618920 13f79535-47bb-0310-9956-ffa450edef68
YARN-2249. Avoided AM release requests being lost on work preserving RM restart. Contributed by Jian He.
svn merge --ignore-ancestry -c 1618972 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618973 13f79535-47bb-0310-9956-ffa450edef68