Include annotation value in error log message

Context
-------

It is helpful to have the annotation value in the error message so you
don't need to check ingress by ingress what happened, as most likely
the problem is that the value provided is not a number

Change-Id: I3c810a114a2ad600aaf5a80c8f17c71ea2964727

pkg/controllers/ingress_controller.go

@@ -120,7 +120,7 @@ func (r *IngressReconciler) calculateIngressWeight(ingress netv1.Ingress) (uint,
 	backendPercentage = float64(backendPercentage) / float64(100)
 	userDesiredWeight, err := strconv.ParseFloat(ingress.Annotations[r.annotationKey("traffic-weight")], 64)
 	if err != nil {
-		return 0, fmt.Errorf("Cannot parse annotation %v", r.annotationKey("traffic-weight"))
+		return 0, fmt.Errorf("Cannot parse annotation %v with value '%v'", r.annotationKey("traffic-weight"), ingress.Annotations[r.annotationKey("traffic-weight")])
 	}
 	if userDesiredWeight < 0 {
 		return 0, fmt.Errorf("Cannot handle negative traffic weights")