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It was removing all old addresses, not just the ones in the new addres slice

Co-Authored-By: Raúl Kripalani <raul@protocol.ai>

Co-Authored-By: Raúl Kripalani <raul@protocol.ai>

instead of trying to piggyback with outgoing messages

per stebalien's request.

- Use nil for the never fire channel when there is no inspection
- Defer a score inspection for shutdown to get one final sample on shutdown

so that bootstrappers can give us a good enough chunk of peers to connect to.