YARN-2049. Added delegation-token support for the Timeline Server. Contributed by Zhijie Shen.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1597130 13f79535-47bb-0310-9956-ffa450edef68
YARN-1936. Added security support for the Timeline Client. Contributed by Zhijie Shen.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1597153 13f79535-47bb-0310-9956-ffa450edef68