lxd/instance/qemu: Use a minimum of 2 network queues
lxd/instance/qemu: Use a minimum of 2 network queues

Otherwise qemu expects a single queue TAP device which isn't what we're
preparing these days :)

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

lxc/lxd,hallyn/lxd,stgraber/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,atxwebs/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,atxwebs/lxd,hallyn/lxd,lxc/lxd,atxwebs/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,atxwebs/lxd,hallyn/lxd