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also check that we don't initially advertise any.

macosx seems to fail intermittently, and that race is the likely culprit.

the first component must be P_P2P, or else we have a specific address to dial

This reverts commit aca83b9b, reversing
changes made to 86b8929d.

This was is not the correct fix. We already expose these addresses via the
host's AllAddrs method. The real problem is probably that we just don't ever
tell anyone about them (unless we disconnect and reconnect to our nearby DHT
nodes).

We need an address gossip protocol.

related to #383

I won't call this *fixed* yet but it should help.

(counting open connections requires copying)