Fix: double check resource existence at receiving addition event

Change-Id: I80fb2b30201e3e770eb5384ecee2b78b32502936
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sServiceWatcher.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sServiceWatcher.java
index c32efa1..489eee3 100644
--- a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sServiceWatcher.java
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sServiceWatcher.java
@@ -171,7 +171,10 @@
             log.trace("Process service {} creating event from API server.",
                     service.getMetadata().getName());
 
-            k8sServiceAdminService.createService(service);
+            if (k8sServiceAdminService.service(
+                    service.getMetadata().getUid()) == null) {
+                k8sServiceAdminService.createService(service);
+            }
         }
 
         private void processModification(Service service) {