GH-550: remove dependency on JPA persistency from oozie-client
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Key: OOZIE-342
URL: https://issues.apache.org/jira/browse/OOZIE-342
Project: Oozie
Issue Type: Bug
Reporter: Hadoop QA
By doing this:
* oozie-client goes back to be minimal light-weigth.
* oozie-core can normally depend on oozie-client.
* no need to use the build-helper-plugin to inject the client source dirs into
core.
* IDEs will import POMs without tweaks.
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