Add default route option to kubevirt network

Change-Id: Ia2a2d9b34ec3c493e04d56c544c22812e32d524a
(cherry picked from commit d95d3524caff5449aded4ff9397c3ed717fc91e6)
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/cli/KubevirtListNetworkCommand.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/cli/KubevirtListNetworkCommand.java
index dfaed15..ded79aa 100644
--- a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/cli/KubevirtListNetworkCommand.java
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/cli/KubevirtListNetworkCommand.java
@@ -67,7 +67,7 @@
                                 0, CLI_NAME_LENGTH - CLI_MARGIN_LENGTH),
                         net.type().toString(),
                         net.segmentId() == null ? "N/A" : net.segmentId(),
-                        net.gatewayIp() == null ? "" : net.gatewayIp().toString());
+                        net.gatewayIp() == null ? "N/A" : net.gatewayIp().toString());
             }
         }
     }