Review Board 3.0 shipped with a dependency on a specific version of

oauth2_provider, which provided some database models. Recent versions

of oauth2_provider have made updates, through Django's migrations. The

current version had migrations as well, but we weren't running a version

of Django that used them. This meant that we were missing a bit of

migration history, which causes conflicts when Django tries to apply

migrations on top of the synced models.
This adds some custom evolutions that tells Django Evolution that we

want to use migrations for this module, and which migrations would have

been applied at the transition point if its models were already synced.

Created and upgraded databases successfully against Django 1.11.