http SendHTTPResponse writes to log instead of logger

[tock-ibm]

// SendHTTPResponse writes HTTP response back including HTTP code number and encode payload

func SendHTTPResponse(w http.ResponseWriter, code int, payload interface{}) {
	response, _ := json.Marshal(payload)
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(code)
	if _, err := w.Write(response); err != nil {
		log.Printf("Warning: failed to write response [%v] to the response writer\n", w)
	}
}