[Network] inbound neighbor walk is broken

[jcnelson]

It appears that there has been a behavioral regression in the node's neighbor walk algorithm. It ought to be the case that if node A contacts node B, then node B should attempt to contact node A, and if successful, add node A to its outbound peer set (making it eligible for data pushed from node B, and eligible for enumeration in response to a GetNeighbors p2p message). This isn't happening anymore.

[saralab]

Misconfiguration could be the problem. Still needs to be evaluated on a testnet

[blockstack-devops]

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