Seems like the tests may fail because we don't wait for nghttpd (the
HTTP2 server used for testing) to actually start listening.
This commit uses asyncio to launch nghttpd and read its stdout until it
starts listening.
Add automated testing infrastructure with tests verifying that
`curl-impersonate` has the same TLS signature as that of the
impersonated browser.
Each wrapper script (e.g. curl_chrome98) is launched to wikipedia.org
while a packet capture is running in the background. The Client Hello
is extracted from the capture, parsed and then compared to the known
browser signature.
The known signatures are stored in a YAML database.