[router] Make mock adapter simplier. Remove non necessary internal states and methods
[router] Make mock adapter simplier. Remove non necessary internal states and methods

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