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

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1493929 13f79535-47bb-0310-9956-ffa450edef68
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
Merge remote-tracking branch 'apache/trunk' into YARN-834