Websocket: First packet from websocket server is not forwarded if in the same buffer as 101 response

First packet from websocket server is not forwarded if in the same buffer as 101 response.

The setup_blind_tunnel code sends the HTTP 101 response by reconstruction the response from MIME encoded data held in the state structure. If the 101 response packet from the websocket server also contains websocket data then this data is not forwarded to the client.