virttest: Remove duplicate lines in qemu_vm

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
virttest.qemu_device: Make virtio-scsi-pci bus can support num_queues

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
Merge pull request #1660 from ypu/mq_virtio_scsi

Add multi queue supoort for virtio-scsi-pci