http2 handle flags

Signed-off-by: Andy Green <andy.green@linaro.org>
http2 track content length add END_STREAM

Signed-off-by: Andy Green <andy.green@linaro.org>
http2 working nghttp fetch multi files completely

Signed-off-by: Andy Green <andy.green@linaro.org>
add newline on libwebsockets.c for ancient compilers

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