[ttnctl-user] Added test for invalid refresh token
[ttnctl-user] Added test for invalid refresh token

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