Ironic section keystone auth should NOT be versioned

During the deployment of nova-compute as nova-ironic in order to deploy ironic using charms:
cs:~gabriel-samfira/ironic-conductor-1
cs:~gabriel-samfira/ironic-api-1
cs:nova-compute-323

Nova would not register any new baremetal nodes.

Looking into nova.conf log in nova-ironic charm:

`Failed to discover available identity versions when contacting https://<KEYSTONE DOMAIN/IP>:35357/v2.0. Attempting to parse version from URL.: keystoneauth1.exceptions.http.NotFound: Not Found (HTTP 404) (Request-ID: req-be790f25-b20c-47e8-95da-f6cfa4f249fa)
2020-12-16 00:00:39.621 260285 ERROR nova.virt.ironic.driver [req-a6f3800e-912b-4425-bfe5-5d7e967390f1 - - - - -] An unknown error has occurred when trying to get the list of nodes from the Ironic inventory. Error: Cannot use v2 authentication with domain scope: keystoneauth1.exceptions.discovery.DiscoveryFailure: Cannot use v2 authentication with domain scope`

The section for ironic in the /etc/nova/nova.conf file has a versioned auth_url option. It SHOULD be unversioned.

Bad:
`auth_url = https://<KEYSTONE DOMAIN/IP>:35357/v2.0`

Good:
`auth_url = https://<KEYSTONE DOMAIN/IP>:35357`

Removing the `/{{auth_ver}}` from the end of the auth_url line in templates/parts/section-ironic solves this problem