YARN-1138. yarn.application.classpath is set to point to  etc., which does not work on Windows. Contributed by Chuan Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556978 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9420. Add percentile or max metric for rpcQueueTime, processing time. Contributed by Liang Xie.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556983 13f79535-47bb-0310-9956-ffa450edef68
YARN-1579. ActiveRMInfoProto fields should be optional (kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1557001 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk