HADOOP-9043. Disallow in winutils creating symlinks with forwards slashes. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478577 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9043. Adding Arpit Agarwal as an additional contributor

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478584 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9483. winutils support for readlink command. Contributed by Arpit Agarwal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478592 13f79535-47bb-0310-9956-ffa450edef68
YARN-625. Move the utility method unwrapAndThrowException from YarnRemoteExceptionPBImpl to RPCUtil. Contributed by Siddharth Seth.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478594 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9483. Adding a file missed in previous commit r1478592

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478633 13f79535-47bb-0310-9956-ffa450edef68