YARN-757. Changed TestRMRestart to use the default scheduler to avoid test failures. Contributed by Bikas Saha.
svn merge --ignore-ancestry -c 1489268 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1489269 13f79535-47bb-0310-9956-ffa450edef68