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there's a rare case where dial returns successfully but for some
reason the RemoteAddr is not yet set. We wait here a while until
it is, and if too long passes, we fail. This is horrendous. This
shouldn't take more than a second. See also:
 * https://gist.github.com/jbenet/5c191d698fe9ec58c49d
 * http://cr.yp.to/docs/connect.html