Fix section trustee of sahara.conf

Tested on Rocky, /v3 needs to be added to the variable auth_url to have
the trust/trustee mechanism to work. All cluster creation would fail
otherwise.

Closes-Bug: #1805896
Change-Id: Ieedac124fa22e5a7ae622c16d47d482007bbec60

ansible/roles/sahara/templates/sahara.conf.j2

@@ -60,4 +60,4 @@ project_name = service
 user_domain_name = {{ default_user_domain_name }}
 username = {{ sahara_keystone_user }}
 password = {{ sahara_keystone_password }}
-auth_url = {{ admin_protocol }}://{{ kolla_internal_fqdn }}:{{ keystone_admin_port }}
+auth_url = {{ admin_protocol }}://{{ kolla_internal_fqdn }}:{{ keystone_admin_port }}/v3