HADOOP-9624. Merging change r1494365 from branch-2 to branch-2.1-beta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1494367 13f79535-47bb-0310-9956-ffa450edef68
YARN-694. Starting to use NMTokens to authenticate all communication with NodeManagers. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1494369 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1494373 13f79535-47bb-0310-9956-ffa450edef68
merge YARN-848 from branch-2. Fix NodeManager to register with RM using the fully qualified hostname. Contributed by Hitesh Shah.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1494391 13f79535-47bb-0310-9956-ffa450edef68