MAPREDUCE-5441. Changed MR AM to return RUNNING state if exiting when RM commands to reboot, so that client can continue to track the overall job. Contributed by xJian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1518821 13f79535-47bb-0310-9956-ffa450edef68