HDFS-3987. Merge change r1543962 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1543967 13f79535-47bb-0310-9956-ffa450edef68
Merge r1543973 from trunk to branch-2 for YARN-1053. Diagnostic message from ContainerExitEvent is ignored in ContainerImpl (Omkar Vinit Joshi via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1543974 13f79535-47bb-0310-9956-ffa450edef68