Added support for disabling standard login
Created by: green-arrow
Only enabled authorization methods are displayed on the sign in page. If no authentication methods are enabled, an appropriate message is shown.
This pull request is in reference to a feature request that was for only allowing login via LDAP. The feature request can be found here: http://feedback.gitlab.com/forums/176466-general/suggestions/3788023-only-allow-login-via-ldap.
The original issue that brought this up is issue #605 (closed). It has since been closed due to being moved to a feature request.
Screenshots of each possible scenario are attached.
