When there are mutiple USB devices with identical vendorId and
productId, with --host-device <vendorId:productId>, virt-install
fails to specify one.
Currently the virt-install add the first node device with
these vendorId and productId.
This fix will throw out an error when argument to --host-device
can't specify unique node device.
For example:
virt-install ${other args} \
--host-device <vendorId:productId>
ERROR 15e1:2007 corresponds to multiple node devices