HADOOP-9515. Add general interface for NFS and Mount. Contributed by Brandon Li

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1493924 13f79535-47bb-0310-9956-ffa450edef68
CHANGES.txt change for HADOOP-9515

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YARN-839. TestContainerLaunch.testContainerEnvVariables fails on Windows. Contributed by Chuan Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1493937 13f79535-47bb-0310-9956-ffa450edef68
YARN-610. ClientToken is no longer set in the environment of the Containers. Contributed by Omkar Vinit Joshi.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1493968 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4626. ClientProtocol#getLinkTarget should throw an exception for non-symlink and non-existent paths.  (Andrew Wang via cmccabe)

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