This commit adds stub parser support and tests for:
- an "http" global option for HTTP/2 endpoint configuration.
- command line options to set http or https port numbers by
specifying -p http=PORT or -p https=PORT. (NOTE: this change
only affects syntax; specifying HTTP and HTTPS ports on the
command line currently has no effect.)
- named.conf options "http-port" and "https-port"
- HTTPSPORT environment variable for use when running tests.
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