schnapps: Update to version 2.9.0
Changed json API a little after discussion with foris-controller developer to make it cleaner.
This need to wait for foris-controller adaptation as mentioned in turris/schnapps!34 (merged)
Blocked by: turris/foris-controller/foris-controller-schnapps-module#10 (closed)
CC: @mmatejek
Edited by Josef Schlehofer