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This commit adds a linkError field to track the value of failures which occur at our node. This field is set when local payments or multi hop htlcs fail in the switch or on our outgoing link. This addition is required for the addition of a htlc notifier which will notify these failures in handleDownstreamPacket. The passing of link error to failAddPacket removes the need for an additional error field, because the link error's failure detail will contain any additional metadata. In the places where the failure detail does not cover all the metadata that was previously supplied by addr err, the error is logged before calling failAddPacket so that this change does not reduce the amount of information we log.