YARN-1285. Changed the default value of yarn.acl.enable in yarn-default.xml to be consistent with what exists (false) in the code and documentation. Contributed by Kenji Kikushima.
svn merge --ignore-ancestry -c 1564190 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1564191 13f79535-47bb-0310-9956-ffa450edef68