Fix #547: Hide social auth

[carbonarok]

Fixes: #547

In the Django Admin, I've hidden the social auth by unregistering Association, Nonce, UserSocialAuth.

[glennmatthews]

Looks reasonable. Can you provide a screenshot of the updated Admin page?

[nniehoff]

Why remove these? I can see them potentially being useful in environments which use SSO

[carbonarok]

@nniehoff currently we have no usecases for these models so think it would be cleaner to disable them. Do you know of any use cases or have you used these models with Nautobot?

[jathanism]

Why remove these? I can see them potentially being useful in environments which use SSO

@nniehoff If you recall, you and I had discussed this probably month ago and asserted that most of these objects are internally used and we have yet to encounter any clear use-cases for them to be used explicitly. The objects will still be available, just not in the admin. We can always bring them back if the time comes for them to be leveraged!

[nniehoff]

I don't have any use cases for these right now, I guess I am hesitant to remove them for the eventuality that they might be useful in troubleshooting, conversely, they might not be. Having never needed them for troubleshooting it's hard to say but I also haven't done much troubleshooting with social-auth

[jathanism]

This does what is needed. And we can still access these objects using the ORM if we need to do anything with them, or even re-enable them if a future use-case arises.