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Added this to better understand how to test the DHT+coordinator together. Some things need to be refined as we haven't really thought about how things like routing update notifications should be exposed to users of the DHT (or even if they should be).
Added a Close method to the coordinator and the DHT calls it from its own Close method.
Added some test helper methods but there is overlap between some of the existing ones. We should work out a nice set of test helpers that can set up configurations of DHTs. I'd like to do something similar to the Topology test helper that the coordinator package uses but the current Topology implementation doesn't rely on libp2p which avoids some timing issues (like waiting for peerstore etc)