HDFS-6455. NFS: Exception should be added in NFS log for invalid separator in nfs.exports.allowed.hosts. Contributed by Abhiraj Butala

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612947 13f79535-47bb-0310-9956-ffa450edef68
YARN-2147. client lacks delegation token exception details when application submit fails. Contributed by Chen He


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612950 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10887. Add XAttrs to ViewFs and make XAttrs + ViewFileSystem internal dir behavior consistent. Contributed by Stephen Chu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612951 13f79535-47bb-0310-9956-ffa450edef68