YARN-1290. Let continuous scheduling achieve more balanced task assignment (Wei Yan via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1537735 13f79535-47bb-0310-9956-ffa450edef68
YARN-786. Expose application resource usage in RM REST API (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1537811 13f79535-47bb-0310-9956-ffa450edef68