Merge r1576023 from trunk. Fixed ClientRMService#forceKillApplication not killing unmanaged application. Contributed by Karthik Kambatla

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1576026 13f79535-47bb-0310-9956-ffa450edef68
Merge r1576035 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1576036 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6070. Cleanup use of ReadStatistics in DFSInputStream.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1576048 13f79535-47bb-0310-9956-ffa450edef68
YARN-1788. Fixed a bug in ResourceManager to set the apps-completed and apps-killed metrics correctly for killed applications. Contributed by Varun Vasudev.
svn merge --ignore-ancestry -c 1576072 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1576073 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6077. Merge change r1576076 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1576077 13f79535-47bb-0310-9956-ffa450edef68