HADOOP-9935. Revert from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523839 13f79535-47bb-0310-9956-ffa450edef68
YARN-1001. Added a web-service to get statistics about per application-type per state for consumption by downstream projects. Contributed by Zhijie Shen.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523855 13f79535-47bb-0310-9956-ffa450edef68
YARN-1184. ClassCastException during preemption enforcement.



git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523863 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4310-trunk-gd