YARN-1863. Fixed test failure in TestRMFailover after YARN-1859. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1580094 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1580096 13f79535-47bb-0310-9956-ffa450edef68