When tests are discovered module can be imported from a different path, so we
must ensure to configure the same method so the global variable sms_queue is
the same.
issue9215
We add the flake8 configuration used so we ensure everyone uses the same.
We remove the usage of __all__ for non public API.
When possible, we rationalize the class name according to its __name__ and module.
issue9082
review297061002
Cédric Krier