Stop replacing dashes with underscores for Kolla interfaces

This also removes test__run_one_with_dashes, because it's not needed
anymore.

Depends-On: https://review.opendev.org/c/openstack/kolla-ansible/+/922478
Closes-Bug: #2070051
Change-Id: Ia11ac49986e2bebba17e533232d8cfd116ba9e73