Ability to completely disable the Add SSH key and Password banners on new account
Description
When Kerberos with SPNEGO auth is enabled, new users don't need to add a sshkey nor a password to checkout a repo. In-fact we discourage it, but we have no way to not have the UI tell users to disobey policy.
Proposal
Add the ability to block one or more of those banners. Preferably as a checklist on /admin/application_settings page.