After a [small chat with the iwd mailing list], I've found out that
`connman` can't scan WiFi networks when using `iwd` as a WiFi backend,
but with `wpa_supplicant` it can.
Are there any plans to add this functionality to `connman`? I would
really like to get rid of `wpa_supplicant` once and for all when this
feature will be available..