qemu: add the tap device to the appropriate bridge
qemu: add the tap device to the appropriate bridge

Ideally we would be able to use scripts/vif but it's very xenstore-heavy

djs55/xenopsd,thomassa/xenopsd,simonjbeaumont/xenopsd,koushikcgit/xenopsd,johnelse/xenopsd,thomassa/xenopsd,djs55/xenopsd,simonjbeaumont/xenopsd,euanh/xenopsd,djs55/xenopsd-previous,djs55/xenopsd-previous,euanh/xenopsd,koushikcgit/xenopsd,koushikcgit/xenopsd,johnelse/xenopsd,cheng--zhang/xenopsd,simonjbeaumont/xenopsd,cheng--zhang/xenopsd,djs55/xenopsd,euanh/xenopsd,cheng--zhang/xenopsd,djs55/xenopsd-previous,thomassa/xenopsd,johnelse/xenopsd