AMBARI-2245. Fix for MR2 service alerts (ncole)

git-svn-id: https://svn.apache.org/repos/asf/incubator/ambari/branches/branch-1.4.0@1489657 13f79535-47bb-0310-9956-ffa450edef68
AMBARI-2227. Populate YARN service metrics in UI. (srimanth)

git-svn-id: https://svn.apache.org/repos/asf/incubator/ambari/branches/branch-1.4.0@1489684 13f79535-47bb-0310-9956-ffa450edef68