Comment 2 for bug 1774203

Indeed, it would be handy to have support of dummy interfaces.

In the WWW, I have seen _workarounds_ like this:

```
network:
  version: 2
  renderer: networkd
  bridges:
    dummy0:
      interfaces: []
      addresses: ['10.111.222.60/24']
```

but a bridge is not a dummy interface.