GH-537: Refactor CoordKillXCommand to TransitionXCommand based
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Key: OOZIE-338
URL: https://issues.apache.org/jira/browse/OOZIE-338
Project: Oozie
Issue Type: Bug
Reporter: Hadoop QA
Refactor coord xcommands to transitionXCommand based. To this end, enhance
coord job/action with pending flag.
Also refactor CoordKillXCommand.
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