Skopeo has problems with ipv6 address literals just like docker as they
use the same underlying checks for url validity. However, we think we
can fix that by using a port forward from the executor to the buildset
registry so that skopeo can connect via ipv4
Go back to aliases the registries on test nodes via /etc/hosts.
Change-Id: I5f9316ffe84de06cb2fb2b65a7e1c31d9f8b0e35
Co-Authored-By: James E. Blair <jeblair@redhat.com>