Merge r1576026 from branch-2. Fixed ClientRMService#forceKillApplication not killing unmanaged application. Contributed by Karthik Kambatla

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1576028 13f79535-47bb-0310-9956-ffa450edef68