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Currently, the Gateway logs all kinds of errors during packet processing on WARN. Whilst it is generally good to be aware of warnings / errors, some of these scenarios are particularly noisy. For various reasons, we may not be able to route a packet arriving from the TUN device. In such cases, we now return an `UnroutablePacket` error to the event-loop which is special-cased to only log on DEBUG. It also includes the 5 tuple as variables, which should make log analysis a bit easier if we want to filter on specific parts of the 5 tuple.