GH-320: remove *Engine layer
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Key: OOZIE-238
URL: https://issues.apache.org/jira/browse/OOZIE-238
Project: Oozie
Issue Type: Bug
Reporter: Hadoop QA
The DagEngine/CoordinatorEngine layers methods are just delegation to a Command.
Every time a new WS operation is added a command is created and a method is
added to the *Engine layer.
The *Engine layer do not provide any value and invoking the commands directly
would be simpler and easier to understand
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