Fix/promise check disk drop until full
This basically reverts https://lab.nexedi.com/nexedi/slapos.toolbox/merge_requests/65, which proven to be too simple and just creating not needed noise in the monitoring.
This basically reverts https://lab.nexedi.com/nexedi/slapos.toolbox/merge_requests/65, which proven to be too simple and just creating not needed noise in the monitoring.