If a Snipe-IT sire has SAML enabled, and the SAML config is sufficiently
borked, the site will fail to even load the login page. That's probably
something that should be examined, but in the meantime, it'd be handy to
not have to manually edit the database to turn off SAML.
In this commit, I'm creating a saml-disable console command. And by
create, i mean i'm copypasta-ing the existing ldap-disable command.
