Structured logging for Broker component
Structured logging for Broker component

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