test(server): fix ERR_SERVER_ALREADY_LISTEN issue with Node v9.0.0 #1549
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Pre-Submission Checklist
make prepush
Node v9.0.0 doesn't allow to call server.listen() multiple times.
(It's not clear why it was necessary earlier)
See: https://nodejs.org/api/errors.html#errors_err_server_already_listen
Changes