[Feature request] Add unencrypted DNS over HTTPS support

[triatic]

When Apache is already running on a server and owns port 443, it is common for it to forward DNS over HTTPS queries to a local unencrypted DNS over HTTPS server or reverse proxy.

For this reason, my request is for Unbound to add support for unencrypted DNS over HTTPS connections.

[wcawijngaards]

Added the option http-notls-downstream: yesno and if you enable that it should perform no tls http service. The dohclient test has the -n commandline option to make it perform a no tls connection to the server.

[triatic]

Perfect, thanks.