[libvirt] [PATCH 00/13] Fix device hotplug with QEMU and -device

The current libvirt code enables use of -device when launching QEMU but forgot to update the equivalent code for hotpluging devices to an already running QEMU. This series implements the latter, doing three core things - Assign a unique PCI slot to the new device - Assign a unique device alias to the new device - Call the device_add function for attaching the device As a minor flaw in the whole plan, it turns out the new -netdev code in QEMU 0.12 does not support hotplugging at all. So this series also switching network setup back to using the old VLAN based syntax. Hopefully we can re-introduce use of -netdev with QEMU 0.13, since it gives important performance benefits.