Comment 12 for bug 1995778

I think the section for Ironic should just drop support for auth_url v2.0. It doesn't work anyways and it's causing problems here. For example, the project_domain_name and user_domain_name are set to using the {{ admin_domain_name }} in the template, which should be default for auth_url v2.0. Additionally, all cloud deployments with supported charm versions only use v3 anyways.