Comment 1 for bug 1732665

Also, if `external-network` is not specified during bootstrap, the logs are spammed with this:

machine-0: 11:33:54 ERROR juju.worker.dependency "firewaller" manifold worker returned unexpected error: cannot respond to units changes for "machine-7": Can't close/open ports without external network

It might be a good idea to stop retrying this when you bootstrap without `external-network`..