Ensure we cleanup cableengine resources

With the OVN-K CNI we were seeing and ungraceful
termination of the GW Pod in GW migration tests,
this patch ensures we cleanup the cableengine
on node resources before exiting.

Signed-off-by: Andrew Stoycos <astoycos@redhat.com>

main.go

@@ -247,6 +247,11 @@ func main() {
 	}()
 
 	<-stopCh
+
+	if err := cableEngine.Cleanup(); err != nil {
+		klog.Errorf("error cleaning up cableEngine resources before removing Gateway")
+	}
+
 	klog.Info("All controllers stopped or exited. Stopping main loop")
 
 	if err := httpServer.Shutdown(context.TODO()); err != nil {