HDFS-6701. Make seed optional in NetworkTopology#sortByDistance. Contributed by Ashwin Shankar.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612625 13f79535-47bb-0310-9956-ffa450edef68
YARN-2295. Refactored DistributedShell to use public APIs of protocol records. Contributed by Li Lu

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612626 13f79535-47bb-0310-9956-ffa450edef68
YARN-2131. Addendum2: Document -format-state-store. Add a way to format the RMStateStore. (Robert Kanter via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612634 13f79535-47bb-0310-9956-ffa450edef68