[test-handler] Use of fatal instead of basic log on utils/testing Ko()
[test-handler] Use of fatal instead of basic log on utils/testing Ko()

jvanmalder/ttn,jvanmalder/ttn,TheThingsNetwork/ttn,TheThingsNetwork/ttn,LoRaWanSoFa/ttn,mgranberry/ttn,TheThingsNetwork/ttn,mgranberry/ttn,jvanmalder/ttn,LoRaWanSoFa/ttn,mgranberry/ttn