Added a compulsory valgrind run in the build of rpms.
This build should fail on memory leak.

Updated the contents of the test harness for SCSI device listing.
Updated the expectations of the device listing test (now passes).

Unit test does not pass yet.

Completed a first test harness based on a system wrapper, simulating sysfs and 3 generic scsi devices.
Created test using the harness.
Created SCSI::DeviceVector class, listing the devices on the system.