Make requests to peers with explicit addresses succeed #3127
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After #3126 (comment) I decided to write a test case ensuring my assumptions are correct and they were not. I had to hack around it a bit to make things work, but also filed libp2p/rust-libp2p#5634 to potentially improve API going forward.
We're basically caching request after explicit dial with addresses and only handling the request after explicit dial either succeeds or fails.
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