integrate tn patches as config options
Integrate the current patches we have for the TN as config options: https://gitlab.cern.ch/kubernetes/openstack-magnum/-/tree/56006979232e9a55e2f53905b627040fa194b3a1
These include:
- Disabling octavia, skip the etcd discovery url, configure the registry in containerd as insecure (openstack-magnum@d1a1ce85)
- Drop config drive (openstack-magnum@56006979)
This should allow us to reuse the magnum docker image in both regions.