OOZIE-1187 reduce memory usage of SLA query (invoked by CLI command) to avoid OOM (egashira via virag)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/branch-3.3@1446002 13f79535-47bb-0310-9956-ffa450edef68
OOZIE-1211 oozie does not support duplicated dataset (jaoki via virag)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/branch-3.3@1446003 13f79535-47bb-0310-9956-ffa450edef68