YARN-1229. Define constraints on Auxiliary Service names. Change ShuffleHandler service name from mapreduce.shuffle to mapreduce_shuffle. Contributed by Xuan Gong.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1526065 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5505. Clients should be notified job finished only after job successfully unregistered (Zhijie Shen via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1526071 13f79535-47bb-0310-9956-ffa450edef68
YARN-1214. Register ClientToken MasterKey in SecretManager after it is saved (Jian He via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1526078 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk