YARN-1661. Fixed DS ApplicationMaster to write the correct exit log. Contributed by Vinod Kumar Vavilapalli.
svn merge --ignore-ancestry -c 1565394 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1565397 13f79535-47bb-0310-9956-ffa450edef68