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Previously we'd use the Debug impl of ResolvedAddress, which rendered
like `ResolvedAddress { name: "some.host.", addr: "10.0.0.1" }`, which
is a bit heavyweight when it shows up in a log where we're indicating
that none of the hosts could be connected.
This commit adds a Display impl that renders that same struct in a
more compact form: `some.host./10.0.0.1`.