Remove noisy debug message from Wavefront output (#3899)

plugins/outputs/wavefront/wavefront.go

@@ -126,7 +126,6 @@ func (w *Wavefront) Write(metrics []telegraf.Metric) error {
 	for _, m := range metrics {
 		for _, metricPoint := range buildMetrics(m, w) {
 			metricLine := formatMetricPoint(metricPoint, w)
-			log.Printf("D! Output [wavefront] %s", metricLine)
 			_, err := connection.Write([]byte(metricLine))
 			if err != nil {
 				return fmt.Errorf("Wavefront: TCP writing error %s", err.Error())