test: refactor test-http-parser

Use common's mustCall (for some reason was implementing its own?), and
other small fixes.

PR-URL: https://github.com/nodejs/node/pull/18219


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>