OOZIE-1167 Fix and rework PartitionDependency Management (rohini via virag)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/hcat-intre@1434998 13f79535-47bb-0310-9956-ffa450edef68
OOZIE-1157 EL function hcat:exists for decision making (rohini via mona)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/hcat-intre@1435004 13f79535-47bb-0310-9956-ffa450edef68