Only update neighbors when module is enabled #2775
Merged
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If the NeighborInfoModule is not enabled, we shouldn't do any bookkeeping upon receiving a packet as we don't do anything with it and we also don't clean-up any neighbors, thus only consuming processing power/writes to flash (and it even caused a bug before #2767). It will still update the
last_sent_by_id
when passing through it in the FloodingRouter.