fix(nsc): sync hairpinning on service modification

When we receive service or endpoint updates from Kubernetes we process a
type of partial sync because the service and endpoints have already been
updated by the handler. However, previously, this partial update did not
include updating the hairpinning rules for services.

This would cause hairpinning changes to be delayed until the next full
sync or until kube-router restart. This changes adds hairpinning into
the partial service sync flow.

pkg/controllers/proxy/network_services_controller.go

@@ -451,10 +451,14 @@ func (nsc *NetworkServicesController) Run(healthChan chan<- *healthcheck.Control
 				klog.V(1).Info("Performing requested sync of ipvs services")
 				nsc.mu.Lock()
 				err = nsc.syncIpvsServices(nsc.serviceMap, nsc.endpointsMap)
-				nsc.mu.Unlock()
 				if err != nil {
 					klog.Errorf("Error during ipvs sync in network service controller. Error: " + err.Error())
 				}
+				err = nsc.syncHairpinIptablesRules()
+				if err != nil {
+					klog.Errorf("Error syncing hairpin iptables rules: %s", err.Error())
+				}
+				nsc.mu.Unlock()
 			}
 			if err == nil {
 				healthcheck.SendHeartBeat(healthChan, "NSC")