Comment 3 for bug 1959930

Notes from IRC:

<mwhahaha> undercloud won't have access to internal_api
<mwhahaha> which is why it was always ctlplane

<mwhahaha> https://github.com/openstack/tempest/blob/master/tempest/config.py#L155
<mwhahaha> need to configure v3_endpoint_type = external
<mwhahaha> it defaults to admin
<mwhahaha> since we switched it, that's no longer ctlplane

<mwhahaha> so yea https://opendev.org/openstack/tripleo-heat-templates/commit/ad97bd70592a57708313d2b87a61f0be01c7b004 broke it
<mwhahaha> but the fix is to set the correct endpoint type in tempest
<mwhahaha> because we should be using external for tempest from UC