tests: populate /dev/disk/by-partuuid for scsi_debug

tests: populate /dev/disk/by-partuuid for scsi_debug

The scsi_debug SCSI devices do not have a symlink in /dev/disk/by-partuuid
because they are filtered out by 60-persistent-storage.rules. That was
worked around by 60-ceph-partuuid-workaround-rules which has been
removed by 9f76b9ff31525eac01f04450d72559ec99927496.

Add create rules targetting this specific case, only for tests since the
problem does not show in real use cases.

Fixes: http://tracker.ceph.com/issues/17100
Signed-off-by: Loic Dachary <loic@dachary.org>
(cherry picked from commit 7cbf1f0a5eced402e6c7242015550668e3b568f3)