Oozie bug-fixing

* Oozie can be installed only in single instance
* Added oozie-default.xml to plugin configs
* Added unit-test for Oozie
* Defined which configs needed to push as defaults to oozie-site.xml
* Now user able to push configs for oozie-site.xml
* heap-size and log redirection will be in the next CR

blueprint edp-oozie-for-vanilla-plugin

Change-Id: I2e58bde39f573127352dcf20daa3d7bef19d4c22
Merge "Oozie bug-fixing"