YARN-716. Making ApplicationID immutable. Contributed by Siddharth Seth.
MAPREDUCE-5282. Updating MR App to use immutable ApplicationID after YARN-716. Contributed by Siddharth Seth.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1487994 13f79535-47bb-0310-9956-ffa450edef68