[handler-broker] Add broker-client to the handler command cli
[handler-broker] Add broker-client to the handler command cli

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