This adds a second registry host. We will remove the other once we've
cut over successfully (should just depend on a DNS update).
Depends-On: https://review.opendev.org/c/opendev/zone-opendev.org/+/886874
Change-Id: Ib6be5ef242ed038c23e0007488f2c21ce10f4fcb
The testinfra_hosts didn't match any hosts under test so the
host.is_listening() check was never run. Skip that test for now, but
add a new test to verify that docker-compose has at least defined the
registry container and is restarting it to keep it "Up"
Change-Id: Ic8d3c7833dd0924fc8a7eb4cbd776cf488d0f928