--events controls CRD informer creation

mgruener suggested that the --events flag could be wired to control whether or
not the CRD source created and started its informer.  This commit makes that
change; good idea!

main.go

@@ -133,6 +133,7 @@ func main() {
 		RequestTimeout:                 cfg.RequestTimeout,
 		DefaultTargets:                 cfg.DefaultTargets,
 		OCPRouterName:                  cfg.OCPRouterName,
+		UpdateEvents:                   cfg.UpdateEvents,
 	}
 
 	// Lookup all the selected sources by names and pass them the desired configuration.

source/store.go

@@ -69,6 +69,7 @@ type Config struct {
 	RequestTimeout                 time.Duration
 	DefaultTargets                 []string
 	OCPRouterName                  string
+	UpdateEvents                   bool
 }
 
 // ClientGenerator provides clients
@@ -270,8 +271,7 @@ func BuildWithConfig(ctx context.Context, source string, p ClientGenerator, cfg
 		if err != nil {
 			return nil, err
 		}
-		startInformer := true
-		return NewCRDSource(crdClient, cfg.Namespace, cfg.CRDSourceKind, cfg.AnnotationFilter, cfg.LabelFilter, scheme, startInformer)
+		return NewCRDSource(crdClient, cfg.Namespace, cfg.CRDSourceKind, cfg.AnnotationFilter, cfg.LabelFilter, scheme, cfg.UpdateEvents)
 	case "skipper-routegroup":
 		apiServerURL := cfg.APIServerURL
 		tokenPath := ""