Remove noisy neighbors

[whoabuddy]

Is your feature request related to a problem? Please describe.

While running a node there are a ton of PeerNotConnected messages that appear in the logs, and make it hard to follow other operations.

Describe the solution you'd like

I would like to see the messages silenced but still appear if running with debug enabled. I am planning to submit a PR following this issue.

Describe alternatives you've considered

It could be left as-is, but if they are not blocking the node's operation the logs would be much cleaner if these were moved over to debug.

Additional context

[blockstack-devops]

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