YARN-321. Changed hadoop-yarn-server-applicationhistoryservice/pom.xml to point to 2.4.0 so as to be able to compile the branch post YARN-321 merge.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1562228 13f79535-47bb-0310-9956-ffa450edef68