client support http without ws

Server support for http[s] as well as ws[s] is implicit.
But until now client only supported ws[s].

This allows the user code to pass an explicit http method
like "GET" in the connect_info, disabling the ws upgrade logic.

Then you can also use lws client as http client, not just ws.

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