This extends the work done in libvirt-virtio-net-multiqueue bp to
allow for enabling multiqueue mode for vrouter VIFs (OpenContrail).
In case of vrouter mechanism is slightly different and a tap device
created by nova-compute must already be in the multiqueue mode,
when it's passed to vrouter.
Implements blueprint vif-vrouter-multiqueue
Co-Authored-By: Michal Dubiel <md@semihalf.com>
Change-Id: I7b20650c8a772fdaa05707e0dfe27ad32481a2d3
146accfada