scsi_debug version 1.69 for lk 2.5.66

As people are using scsi_debug to simulate a large number of disks to play with the dev_t expansion, some problems have come to light.

Changelog:
- change num_devs to num_tgts
so now the user can independently modify the number of hosts (add_host), the number of targets per host (num_tgts) and the number of luns per target (max_luns)
- num_tgts sets scsi_host::max_id after allowance is made for the initiator's target id
- max_luns default changed to 1 and it is sysfs writeable
- REPORT LUN response cleaned up. Could now possibly generate a response indicatimg there were up to 16,384 logical units available
- clean up sense buffer generation

Updated http://www.torque.net/sg/sdebug25.html

Doug Gilbert