OOZIE-1379 Generate SLA end_miss event only after confirming against persistent store (mona)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/branch-4.0@1497996 13f79535-47bb-0310-9956-ffa450edef68
Sync CoordKillXCommand with trunk code

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/branch-4.0@1497997 13f79535-47bb-0310-9956-ffa450edef68