Use endpoint rather than url in clouds.yaml with no keystone

When keystone is not in use, the clouds.yaml file generated by bifrost
uses an auth_type of "none". This does not appear to work, and results
in the following error (even with OS_CLOUD=bifrost):

Missing parameter(s):
Set a cloud-name with --os-cloud or OS_CLOUD

This change modifies the "url" parameter to be "endpoint", which works
correctly.

Change-Id: I9b84739dcb90b6482b332676244c68642042dfd4
Closes-Bug: #1754070
(cherry picked from commit e1a167a3bb)

playbooks/roles/bifrost-keystone-client-config/templates/clouds.yaml.j2

@@ -16,5 +16,5 @@ clouds:
 {% else %}
   bifrost:
     auth_type: "none"
-    url: {{ ironic_api_url }}
+    endpoint: {{ ironic_api_url }}
 {% endif %}