Add tests for mock runner type (#23)

Test for OSS currently fails as the runner type parameter is not
implemented
Implements runner type for mock goal (#23)
Fix license check configuration

Exclued soapui composite projects located in the it directory.
Remove duplication in mock and test mojo (#23)

As the mock and test runner shared parameters, we now configure these
parameters in only one place (abstract mojo) to avoid duplication.
Update readme for #23
Merge branch 'improvement-23-mock-runner-type'