Hello,

I've been looking into the NPN and ALPN support in the various TLS backends to
make it possible to use both extensions without requiring HTTP2 support to be
built and enabled.

This was to implement TLS False Start checks like firefox and chrome do, but IMO
I also managed to simplify and clean-up the code, so implementing additional
protocols (e.g. SPDY) would be much easier.

See attached patches.

Cheers

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