YARN-2704. Changed ResourceManager to optionally obtain tokens itself for the sake of localization and log-aggregation for long-running services. Contributed by Jian He.

(cherry picked from commit a16d022ca4313a41425c8e97841c841a2d6f2f54)
HDFS-5928. Show namespace and namenode ID on NN dfshealth page. Contributed by Siqi Li.
HDFS-7282. Fix intermittent TestShortCircuitCache and TestBlockReaderFactory failures resulting from TemporarySocketDirectory GC (Jinghui Wang via Colin P. McCabe)
(cherry picked from commit 518a7f4af3d8deeecabfa0629b16521ce09de459)
YARN-2502. Changed DistributedShell to support node labels. Contributed by Wangda Tan
(cherry picked from commit f6b963fdfc517429149165e4bb6fb947be6e3c99)