Merge 1519112. from branch-2 to branch-2.1-beta for YARN-771. AMRMClient support for resource blacklisting (Junping Du via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1519113 13f79535-47bb-0310-9956-ffa450edef68