common: Add test-webserver case for TLS with large header
common: Add test-webserver case for TLS with large header

This was meant to reproduce https://bugzilla.redhat.com/show_bug.cgi?id=1785509
but it doesn't for now: Apparently curl and browsers don't close their
writing end of the socket as soon as the request is written, which makes
reading on the next block hang through GnuTLS. The test case does close
its socket (as it doesn't know otherwise when the response is complete),
which seems to avoid that bug.

This is still useful as a regression test, though.

moraleslazaro/cockpit,deryni/cockpit,cockpituous/cockpit,cockpit-project/cockpit,deryni/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpituous/cockpit,deryni/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,deryni/cockpit,deryni/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,mvollmer/cockpit,deryni/cockpit,garrett/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,garrett/cockpit,martinpitt/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,deryni/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,garrett/cockpit,cockpit-project/cockpit,cockpituous/cockpit,cockpituous/cockpit,garrett/cockpit