Link project as ONAP oparent module child

Link project as ONAP oparent module child

- Downgraded checkstyle-plugin version to not break build - oparent
uses deprecated config property that cannot be overriden... Also it
uses plugin version from 2014...
- Moved jacoco plugin definition for similiar reasons.
- Bumped maven-surefire-plugin.
- Also added missing license in file. Not sure why CI did not catch
that one earlier
- removed nexus properties that should be inherited from onap
`version` artifact (parent of oparent)
- Use upgraded maven-failsafe-plugin - works with java 8, not sure
about Java 9+

Change-Id: I47e441315cc0e1dc49ed474450db0ee3d2701a10
Issue-ID: DCAEGEN2-700
Signed-off-by: Filip Krzywka <filip.krzywka@nokia.com>
Signed-off-by: Piotr Jaszczyk <piotr.jaszczyk@nokia.com>