test: add common.dns.errorLookupMock

PR-URL: https://github.com/nodejs/node/pull/17296
Refs: https://github.com/nodejs/help/issues/687


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>