Transform scsi list into sourceable script
Add variable to get the number of scsi disks
Remove unused variables
Assign variable values closer to their usage point
Use /etc/scsi.list while mounting hard disks
Use only scsidevs to count the number of scsi devices
Use content of /etc/scsi.list to detect the plugged drive
Fully drop scsi.list file on config partition
Get list of scsi devices from sys filesystem