Support multi-physnet networking model for kubevirt

Change-Id: Ic245d48dd2e801080c388cf752860fd2f82aa780
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/NetworkAttachmentDefinitionWatcher.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/NetworkAttachmentDefinitionWatcher.java
index 291db11..186ca90 100644
--- a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/NetworkAttachmentDefinitionWatcher.java
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/NetworkAttachmentDefinitionWatcher.java
@@ -207,7 +207,9 @@
 
             KubevirtNetwork network = parseKubevirtNetwork(resource);
             if (network != null) {
-                adminService.createNetwork(network);
+                if (adminService.network(network.networkId()) == null) {
+                    adminService.createNetwork(network);
+                }
             }
         }