test: throw Error objects instead of literals

test-tls-econnreset and test-http-response-status-message throw literals
instead of Error objects. Use common.fail() which throws an
AssertionError.

PR-URL: https://github.com/nodejs/node/pull/11168


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>