fix: keystone admin ep in catalog does not exist

This fixes the default admin endpoint in the catalog so that what is
returned is something that is resolvable in the cluster.

Example, the current url returned for admin is:
 http://keystone.openstack.svc.cluster.local:5000/v3

That service host and port is invalid, what works is:
 http://keystone-api.openstack.svc.cluster.local:5000/v3

base-helm-configs/keystone/keystone-helm-overrides.yaml

@@ -947,8 +947,9 @@ endpoints:
       #   project_domain_name: default
       #   default_domain_id: default
     hosts:
-      default: keystone
+      default: keystone-api
       internal: keystone-api
+      admin: keystone-api
     host_fqdn_override:
       default: null
       # NOTE(portdirect): this chart supports TLS for fqdn over-ridden public