Completely changed how the module work and reuse the model from xbus_common

This simplifies handling several different event type in a single method.

It contained a direct commit that can cause havok on tests, for example
running the modules tests on the same base failed. Without the commit,
that resolve the pylint message about it.

If the feature is needed it will be necessary to code it again, probably
by using savepoint for each model.

Add a sort on id for priority as there is nothing that makes the sorting
consistent on two event type with the same priority.
The alternative would have been to make the priority unique.