HDFS-6460. Ignore stale and decommissioned nodes in NetworkTopology#sortByDistance. Contributed by Yongjun Zhang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1601535 13f79535-47bb-0310-9956-ffa450edef68
YARN-2030. Augmented RMStateStore with state machine. Contributed by Binglin Chang

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1601537 13f79535-47bb-0310-9956-ffa450edef68