Add a configurable workaround for a bug in qemu < 2.0 that prevented VLANs from working.
Add a configurable workaround for a bug in qemu < 2.0 that prevented VLANs
from working.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars