HDFS-4887. TestNNThroughputBenchmark exits abruptly. Contributed by Kihwal Lee.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1501841 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4962. Use enum for nfs constants. Contributed by Tsz Wo (Nicholas) SZE.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1501851 13f79535-47bb-0310-9956-ffa450edef68
YARN-368. Fixed a typo in error message in Auxiliary services. Contributed by Albert Chu.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1501852 13f79535-47bb-0310-9956-ffa450edef68
YARN-295. Fixed a race condition in ResourceManager RMAppAttempt state machine. Contributed by Mayank Bansal.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1501856 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4969. WebhdfsFileSystem expects non-standard WEBHDFS Json element. (rkanter via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1501868 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-xxx-hadoop-auth-kerberos-realm-trunk-gd