Merge pull request #504 from luckyh/hdparm-disable-spapr_vscsi

qemu.tests.hdparm: disable spapr_vscsi

qemu/tests/cfg/hdparm.cfg

 - hdparm: install setup image_copy unattended_install.cdrom
     only Linux
     no sd
-    no virtio_scsi
+    no virtio_scsi spapr_vscsi
     no virtio_blk
     type = hdparm
     get_disk_cmd = \ls /dev/[vhs]da