*Admin User when using Authentication Provider*\nWhen using\n```    AUTH_DB,\n    AUTH_LDAP,\n    AUTH_OAUTH,\n    AUTH_OID,\n    AUTH_REMOTE_USER```\nOnly users registered with the Authentication service provider can login.\n\nDrawback:\nIf we deploy Superset for a client and are required to be an Admin, we have to ask them to create a user within their auth system. Some client's user creation protocols don't all for such kind of users to be created.