scsi_id: derive a UID for a SCSI-2 not compliant with the page 83

This patch is to enable the use of scsi_id to derive a UID for a SCSI-2
device which is not compliant with the page 83 inquiry reply format for
either SPC-2 or SPC-3.  In this case, the page 83 reply does not
contain a list of  Identification descriptors but a single binary encoded
hexa-decimal Vendor Specified Identifier.

The update is being driven by the need for scsi_id to support older
model EMC Symmetrix hardware, that is, models 4, 5, and 6.