YARN-638. Modified ResourceManager to restore RMDelegationTokens after restarting. Contributed by Jian He.
svn merge --ignore-ancestry -c 1487720 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1487721 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9574. Fix for timing issues in the original patch's test-case.
svn merge --ignore-ancestry -c 1487722 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1487723 13f79535-47bb-0310-9956-ffa450edef68
merge YARN-719 from trunk. Move RMIdentifier from Container to ContainerTokenIdentifier. Contributed by Vinod Kumar Vavilapalli.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1487746 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd