- dhcp and ipv4ll should probably be skipped for "lo" devices, even
if the user has a catchall .network file installed, that might
theoretically match it.
- - when I plug/unplug my wired ethernet the operational state changes
- between "unknown" and "carrier", not "dormant" and "carrier".
- we probably should introduce a new operational state that
indicates that we are trying to acquire some configuration for a
link but haven't acquired any yet. Just to inform the admin that