* Revert "Ran make migration on third_party_auth (#23253)"
This reverts commit 49be65cc58.
* Removing provider.util import
* Removing further provider things
* Adding hash tests
Django 2.0 will make this field required for `ForeignKey` and `OneToOneFields`.
In previous versions the option defaulted to `models.CASCADE` when not
specified. This change should make the deprecation warnings in the current
Django version go away.
The migrations where also modified, but the changes should not cause a change in
the database schema since `models.CASCADE` was already the old default.
