Enthusiastic logging when interface goes away

[A. Schulze]

Eric Luehrsen via Unbound-users:

> Reduce log noise when an interface goes missing during
> reconfiguration. It is a crude patch requiring quality control
> but it demonstrates the concept.

sorry, I don't really like that concept.

without proposing details: unbound is able to detect a destination as  
unreachable.
Why doesn't catch this logic Mike's "link down" state?

Andreas