YARN-1812. Fixed ResourceManager to synchrously renew tokens after recovery and thus recover app itself synchronously and avoid races with resyncing NodeManagers. Contributed by Jian He.
svn merge --ignore-ancestry -c 1576843 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1576844 13f79535-47bb-0310-9956-ffa450edef68