Discard pod updates for other nodes

We were filtering pods to those on the local node already, for regular
reports, so we should also filter events that come in asynchronously.

probe/kubernetes/reporter.go

@@ -193,6 +193,10 @@ func (r *Reporter) Stop() {
 func (Reporter) Name() string { return "K8s" }
 
 func (r *Reporter) podEvent(e Event, pod Pod) {
+	// filter out non-local pods, if we have been given a node name to report on
+	if r.nodeName != "" && pod.NodeName() != r.nodeName {
+		return
+	}
 	switch e {
 	case ADD:
 		rpt := report.MakeReport()