Removes API translation layer into port/portgroup internal_info
Removes internal logic to support use of VIFs stored in the extra
field, which effectively means all vif binding must now utilize
vif attachment and detachment.
This is a change that we likely should have pushed forward a couple
years back, but I didn't want to break compatability with very old
of ironic or standalone users which were deploying instances using
very old instructions. That being said, it is necessary to remove
the legacy vif support so new access controls can properly wrap
vif API endpoints.
Depends-On: https://review.opendev.org/c/openstack/ironic-tempest-plugin/+/769204
Change-Id: I588b3a64475656542389ff83786189e2dc16d35c