p2p: limit connections made by dht and pubsub

[algorandskiy]

Status

p2pNet calls DialPeersUntilTargetCount(n.config.GossipFanout) to maintain connections but DHT and PubSub maintain their own connections to algod peers. Since all these peers support multiple protocols including /algorand-ws/1.0.0, they establish such protocol stream. There was a counter in p2p feature PR to drop this stream from non DialPeersUntilTargetCount connections but it only handles DHT. Leaving us in a situation where agreement traffic not exchanged but transactions are well exchanged via PubSub.

Expected

Need to have a way to limit total connections made by p2p node.

Solution

TBD