[SCSI] scsi_scan: fix report lun problems with CDROM or RBC devices

Apparently no ATAPI CD/DVD actually supports REPORT LUNS (in spite of
claiming scsi-3 compliance, where it's mandatory) and worse, some
crash or flake out on being sent the command.  This may actually be
due to a conflict between SPC and MMC with MMC not listing REPORT LUNS
as mandatory.  The same standards conflict exists for RBC as well.

Fix all of this by reversing the blacklists for CDROM and RBC devices
(i.e. now they have to have the BLIST_REPORTLUNS2 flag set even if the
inquiry data returns scsi-3 compliance).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>