Track number of connections per address in peering strategy #1412
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In the situation where the discovery system discovers the same address for two different peers (Alice and Bob), the code will try to connect to both.
Inevitably, one of them will redirect to the wrong peer, for example connecting to Alice will actually connect to Bob.
Later, when we disconnect a second time from Bob, a state mismatch is found and a panic happens.
This PR does things properly and tracks the number of connections per peer.
We also handle weird situations properly, such as connecting to the same address multiple times leading to multiple different peer ids, by removing the
remove_address
function entirely.