Try and handle more NetworkManager errors.

These generally don't matter too much but they look bad.

This change should both log a bit more (tailored for network service runs
where newlines are suppressed - thus not quite as nice when running ifup
manually, but nicer in the journal log for network.service)

It should also handle some more cases where there is no DEVICE variable
(typically when the device is not present and the ifcfg- file does not
set it explicitly, or when it is set explicitly but it's not plugged in)

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