WIP: remove django-oidc-provider

[henrikhorluck]

All tests using OIDCTestCase now no longer run auth checks. That
generally speaking simplifies most tests.

The general pattern is:

1. Create user + set user to the created one in setup
2. Remove **self.headers
3. logout/set auth to None where there was a **self.bare_headers
4. If the test uses self.get_list_url and friends also add the mixin

Some tests are still not passing locally, I find the error in photoalbum
very strange.