Don't save Neighbors to flash when receiving #3519
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Now that with 2.3 neighbors can also be detected for packets other than NeighborInfo, it may lead to excessive writing to flash, causing issues like #3516 and it may wear out the flash rather quickly.
Now it will not write to flash when receiving a packet, but only before it broadcasts its own NeighborInfo and there is a new neighbor, or there is one removed.