adding missing class to serializer

Change-Id: I9afe8f71f28ef34b3539550dcf296b9f1237844a
diff --git a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/tenantnetwork/impl/TenantNetworkManager.java b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/tenantnetwork/impl/TenantNetworkManager.java
index 97b4c3d..c5290ad 100644
--- a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/tenantnetwork/impl/TenantNetworkManager.java
+++ b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/tenantnetwork/impl/TenantNetworkManager.java
@@ -26,6 +26,7 @@
 import org.onosproject.store.serializers.KryoNamespaces;

 import org.onosproject.store.service.Serializer;

 import org.onosproject.store.service.StorageService;

+import org.onosproject.vtnrsc.DefaultTenantNetwork;

 import org.onosproject.vtnrsc.PhysicalNetwork;

 import org.onosproject.vtnrsc.SegmentationId;

 import org.onosproject.vtnrsc.TenantId;

@@ -76,6 +77,7 @@
                 .withPurgeOnUninstall()

                 .withSerializer(Serializer.using(Arrays.asList(KryoNamespaces.API),

                                                  TenantNetworkId.class,

+                                                 DefaultTenantNetwork.class,

                                                  TenantNetwork.State.class,

                                                  TenantId.class,

                                                  TenantNetwork.Type.class,