YARN-897. Ensure child queues are ordered correctly to account for completed containers. Contributed by Djellel Eddine Difallah.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1505146 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5010. Reduce the frequency of getCurrentUser() calls from namenode. Contributed by Kihwal Lee.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1505160 13f79535-47bb-0310-9956-ffa450edef68