YARN-837. Moved yarn.ClusterInfo into MapReduce project as it doesn't belong to YARN. Contributed by Zhijie Shen.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1493676 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9517. Documented various aspects of compatibility for Apache Hadoop. Contributed by Karthik Kambatla.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1493693 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4312-trunk-gd