svn merge -c 1577554 FIXES: MAPREDUCE-5751. MR app master fails to start in some cases if mapreduce.job.classloader is true. Contributed by Sangjin Lee


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1577556 13f79535-47bb-0310-9956-ffa450edef68