[PATCH] test: let the OS choose a port for smtp-dummy

[Daniel Kahn Gillmor]

On Tue 2019-05-07 07:20:49 -0300, David Bremner wrote:
> This should avoid potential collisions if we start running multiple
> smtp-dummy processes in parallel.

This is excellent, simple, and clearly the right thing to do.  I've
reviewed it, and am running it on my own development branch with no
problems.  Thanks, Bremner!

please merge.

       --dkg
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