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License: MIT
Signed-off-by: Lars Gierth <larsg@systemli.org>

Doing the multistream negotiation in sync causes hanging issues.
This commit accepts transport connections and starts the negotiation
in a separate goroutine, sending it down a channel when its ready.

Previously we were unable to dial on a given transport if there were no
listener addresses defined for that. This meant that most people couldnt
use utp (as they had no utp listener transport to dial from).