Script for generating LOTS of SCSI disk and partition devices in
the fake sysfs we use for udev testing.
This script is supposed to be run after sys-script.py. It uses
code from sys-script.py as template to generate additional SCSI disk data
structures. Together with the "generator" code in udev-test.pl
added in the previous patch, it allows to run udev tests with almost
arbitrarily many devices, and thus to do performance scaling tests.