[Network] GetNeighbors reply should alternate between including public-only versus public/private IPs

[jcnelson]

For a variety of reasons, nodes may need to report private IP ranges to each other on neighbor walk (e.g. so nodes in a cluster can find each other). However, this is useless for downstream nodes. To address this without changing the protocol, the node should alternate (with some configurable probability) between reporting public-only neighbors and a mix of public/private nodes.

[blockstack-devops]

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