YARN-986. Changed client side to be able to figure out the right RM Delegation token for the right ResourceManager when HA is enabled. Contributed by Karthik Kambatla.
svn merge --ignore-ancestry -c 1574190 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1574192 13f79535-47bb-0310-9956-ffa450edef68