confirm upgrade actually for websocket

Signed-off-by: Andy Green <andy.green@linaro.org>
test server correct header naming order

Signed-off-by: Andy Green <andy.green@linaro.org>
add http2 settings token

Signed-off-by: Andy Green <andy.green@linaro.org>
http2 add h2c upgrade and http2 connmode

Connection upgrade handling for h2c
Establish http2 union struct and http2 connmode
No protocol code yet

Signed-off-by: Andy Green <andy.green@linaro.org>