Hide social accounts configuration and password change form.

This makes sence on a corporate setup where SSO is enforced, and
therefore social accounts won't be used for authentication.
Plus, at least when using Shibboleth, it makes no sence to show the
password change form in Gitlab.
Hide HTTP repository clone URL.

When the application is behind Shibboleth access control,
the HTTP Basic Auth will not work and therefore HTTP access to
repositories is not possible.
Hide HTTP wiki repository clone URL.

The same that was done for main repository HTTP clone URL.