Allow relays to set peering policy
As mentioned in the discussion at tor-relays@ ([1], [2]), it would be nice to have some kind of peering policy for relays so that relay operators could restrict connections with suspicious/malicious relays themselves.
Having PeeringPolicy similar to ExitPolicy (accept, reject) is what comes to mind first. Though it may not be the best solution.
Also, as a side effect it can allow to have smaller state table/less file descriptors for average relay that can help with scaling of the network in the future.
[1] https://lists.torproject.org/pipermail/tor-relays/2016-July/009633.html [2] https://lists.torproject.org/pipermail/tor-relays/2016-July/009641.html
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