Now we cant access connp directly since it is an opaque pointer.  Technically it would have been neater to signal back the app layer to not call this parser henceforth without setting an error event.  But we allow only 2 return values from the parser functin -0 and -1.

So I let the parser be called every time, and allow libhtp to immediately check the status as TUNNEL and return immediately.  Does what it used to do previously.