A utility command to enable or disable certain authentication backends
for a realm from the command line. Can be helpful e.g. if the
administrator accidentally disables some auth methods in the UI leaving
themselves with none remaining that they could actually use to log back
into the organization.
Example usage:
```
(zulip-py3-venv) vagrant@c32c137f59a0:/srv/zulip$ ./manage.py change_auth_backends -r zulip --show
Current authentication backends for the realm:
Enabled backends:
Dev
Email
GitHub
GitLab
Google
Apple
SAML
OpenID Connect
(zulip-py3-venv) vagrant@c32c137f59a0:/srv/zulip$ ./manage.py change_auth_backends -r zulip --disable GitHub
Disabling GitHub backend for realm Zulip Dev
Updated authentication backends for the realm:
Enabled backends:
Dev
Email
GitLab
Google
Apple
SAML
OpenID Connect
Disabled backends:
GitHub
Done!
(zulip-py3-venv) vagrant@c32c137f59a0:/srv/zulip$ ./manage.py change_auth_backends -r zulip --enable GitHub
Enabling GitHub backend for realm Zulip Dev
Updated authentication backends for the realm:
Enabled backends:
Dev
Email
GitHub
GitLab
Google
Apple
SAML
OpenID Connect
Done!
```
(cherry picked from commit bf7fc5701f)
Mateusz Mandera