Allow silencing "Adding permission ..." for tests

[Martin H.]

In our automated tests, the "Adding permission xxx" lines are congesting the test output. IMHO there should be a way to disable them, at least for tests.

I refer to the following line of code: ​https://github.com/django/django/blob/181fb60159e54d442d3610f4afba6f066a6dac05/django/contrib/auth/management/__init__.py#L86

[Simon Charette]

Unless I'm missing something these messages will only be displayed during tests if --verbosity=3 as the test command calls migrate with verbosity - 1 and these messages are only displayed ​if verbosity >=2 just like content type creation message.

Given --verbosity=3 is the maximum level and should be synonym of print everything I don't think adding an extra test option to disable these particular messages is worth it. If you really want to disable them during tests only you could unregister the post_migrate signals in your test runner class setup with one that always pass a different verbosity.