Fixed the qa_test for scenario_damage

The problem is that I had copied some boilerplate from the event_based QA test involving the parameter intensity_measure_types_and_levels whereas the needed parameter was intensity_measure_types. So the test was working by accident. Also I added two missing `__init__.py` files: this is the reason why the test was not picked up in the CI environment.

Luigi is using this branch to perform a different task, i.e. to change the qa tests to use the right numbers from the old engine.