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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).

go-msgio implements the message length limit (currently 8MB), so the
secio reader can get away without re-implementing this logic.

Instead, the reader lets go-msgio allocate a buffer when the output
buffer is too small to hold the incoming message. This buffer is kept
and drained into the output buffer(s) of Read() calls and released back
to the msgio instance once it is fully drained.

License: MIT
Signed-off-by: Randall Leeds <randall@bleeds.info>