Notify kubevirt router internal and external network related events

1. Add networkName attribute into FloatingIp class.

Change-Id: I4aeb8031ef4c86d7ae9a6423276b024c05fe0649
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtNetworkHandler.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtNetworkHandler.java
index 18caff1..7f539de 100644
--- a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtNetworkHandler.java
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtNetworkHandler.java
@@ -394,6 +394,7 @@
         KubevirtNode electedGateway = gatewayNodeForSpecifiedNetwork(network);
         if (electedGateway == null) {
             log.warn("There's no elected gateway for the network {}", network.name());
+            return;
         }
 
         setGatewayArpRule(network, PRE_FLAT_TABLE, electedGateway.intgBridge(), install);