Comment 9 for bug 1705804

Oh I see: sysconfig.py needs to do the same thing as netplan.py

sysconfig.py is missing this logic:

            if 'dns_nameservers' in subnet:
                nameservers += _listify(subnet.get('dns_nameservers', []))
            if 'dns_search' in subnet:
                searchdomains += _listify(subnet.get('dns_search', []))

etc etc