[debt/metadata] Add server time to metadata
[debt/metadata] Add server time to metadata

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