Cleanup:
- Old code comments removed
- Debug comments removed
- Old log entries for debug removed

Overall summary of changes:
- The base of this code comes from some work done by Rafael in here:
    https://lab.nexedi.com/nexedi/slapos.toolbox/blob/master/slapos/agent/tester.py
- Minor refactoring in communication with slap objects for supply and request.
- New setters (they will be refactored soon)