Remove unused buffer

This has been replaced by the improved requestLog.

go/fake-http/fake-http.go

		userAgent := req.Header.Get("User-Agent")
		log.Printf("%s %s - %d (%s, %q)", req.Method, req.URL, resp.StatusCode, req.RemoteAddr, userAgent)
		buf := new(bytes.Buffer)
		out, err := httputil.DumpRequest(req, true)
		if err != nil {
			log.Printf("Error: Dumping request: %s", err)
			return
		}
		buf.Write(out)
		if resp.Header.Get("Content-Type") == "application/json" {
			pretty, err := prettyfyJSON(resp.Body)
				resp.Body = ioutil.NopCloser(bytes.NewReader(pretty))
			}
		}
		respOut, err := httputil.DumpResponse(resp, true)
		if err != nil {
			log.Printf("Error: Dumping response: %s", err)
			return
		}
		buf.Write([]byte("\n"))
		buf.Write(respOut)
		buf.Write([]byte("\n"))
		requestLog = append(requestLog, LogEntry{
			Request:  out,