Evict dead `BoundPeer`s from `RoutingTable`

[greymistcube]

There seems to be some evidence that RoutingTable, or rather, KademliaProtocol to be more precise, isn't working as intended. For one, querying peerChainState seem to return abnormally high number of failed state queries to adjacent peer nodes. The problem may not entirely be necessarily due to a mismanagement of the local RoutingTable, but failure to respond promptly by remote nodes. Either way, the cause of the issue, or perhaps a justification for the phenomenon of a possible non-issue, must be further investigated and be fixed if necessary.

[stale[bot]]

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