Fix freezer deployment

Following up on [1] and fix freezer deployment accidentally broken
after removing 'domain_name' from the 'openstack_auth'.

1. Ib631e2211682862296cce9ea179f2661c90fa585

Change-Id: Ie928f8a4506f41407d76edcb6b52ca7cddb52214
Signed-off-by: Maksim Malchuk <maksim.malchuk@gmail.com>

ansible/roles/freezer/templates/freezer.conf.j2

@@ -16,9 +16,9 @@ os_username = {{ openstack_auth.username }}
 os_password = {{ openstack_auth.password }}
 os_auth_url = {{ openstack_auth.auth_url }}
 os_project_name = {{ keystone_admin_project }}
-os_project_domain_name = {{ openstack_auth.domain_name }}
 # TODO: transition to system scoped token when freezer supports that
-# configuration option
+# configuration option, os_project_domain_name should be removed.
+os_project_domain_name = {{ default_project_domain_name }}
 os_user_domain_name = {{ openstack_auth.user_domain_name }}
 {% endif %}