MAPREDUCE-3240. Fixed NodeManager to be able to forcefully cleanup its containers (process-trees) irrespective of whether the container succeeded, or killed. Contributed by Hitesh Shah. Added the new files which I missed earlier.
hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/util/
hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/util/ProcessIdFileReader.java