Bug#856559: predictable interface name broken for virtio-ccw

[Martin Pitt]

Control: notfound -1 233-1
Control: tag -1 pending

Viktor Mihajlovski [2017-03-02 13:52 +0100]:
> in Linux running as a KVM guest on a s390 system, virtio interfaces are
> named eth<n> instead of enc<address> as expected for ccw devices.

The patch is fairly intrusive, but as this only affects s390x, unstable names
for network interfaces are awkwar, and this also avoids upgrading trouble from
Stretch to Buster I agree this should be backported. Committed to stretch
branch.

Thanks,

Martin