OOZIE-1466 current EL should not check for less than or equal to zero (rohini)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/branch-4.0@1506947 13f79535-47bb-0310-9956-ffa450edef68
OOZIE-1467 Bundle not killed if coordinator fails due to db exception (rohini,virag via virag)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/branch-4.0@1507047 13f79535-47bb-0310-9956-ffa450edef68