set OAUTH_BASE_URL in local_settings.py

[karmaking]

currently, OAUTH_BASE_URL must to be set in settings.py. It should be in local_settings.py.

[chrisjsimpson]

There's no need for anything to be in local_settings.py, it's just for overriding anything in settings.py for local development.

Please explain the scenario why OAUTH_BASE_URL needs to be in local_settings.py

otherwise I think this issue should be closed as non issue.