test: use invalid host according to RFC2606

PR-URL: https://github.com/nodejs/node/pull/14863
Refs: https://github.com/nodejs/node/pull/14781
Refs: https://tools.ietf.org/html/rfc2606#section-2


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>