HDFS-6783: Merging r1618635 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618636 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-6033. Updated access check for displaying job information 
(Yu Gao via Eric Yang)



git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618649 13f79535-47bb-0310-9956-ffa450edef68