Redirect users away from /login, if they are already logged in

[n0emis]

Environment

• Python version: 3.8.5
• NetBox version: 2.8.9

Proposed Functionality

When a already logged-in user access the /login url, they should be redirected to home or to the page from the parameter next.

I created a simple PoC: n0emis@061549b

Use Case

This would be especially usefull when using a Remote-Auth-Backend like django.contrib.auth.middleware.PersistentRemoteUserMiddleware, where the HTTP-Header only get's send when accessing the login-page.

Database Changes

No database-changes required

External Dependencies

No new external Dependencies required

[n0emis]

@DanSheps Is this accepted so I can work on a PR?

[jeremystretch]

@n0emis Yes, I'll assign this to you.