Merge -c 1465171 from branch-1 to branch-1.2 to fix MAPREDUCE-5131. Fix handling of job monitoring APIs during JobTracker restart. Contributed by Arun C. Murthy.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2@1465173 13f79535-47bb-0310-9956-ffa450edef68