Re: [libvirt] [PATCH v2 1/2] add hostdev passthrough common library

Write separate module for hostdev passthrough common library so that it could be used by all hypervisor drivers and maintain a global hostdev state. Changes to v1: * add scsi part to common library * instead of hardcode, check for <driver name='kvm/vfio/xen'/> setting, call virPCIDeviceSetStubDriver to set stub driver. For libxl driver, a <driver name='xen' /> is needed.

* rebase to current libvirt changes