ONOS-2848 Fix bug of post subnet about class is not registered.

Change-Id: I534bb0628bd65c58a38d7696ae63d5bd56d25c86
diff --git a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/subnet/impl/SubnetManager.java b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/subnet/impl/SubnetManager.java
index ab810a8..9238257 100644
--- a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/subnet/impl/SubnetManager.java
+++ b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/subnet/impl/SubnetManager.java
@@ -28,6 +28,7 @@
 import org.onosproject.store.service.Serializer;

 import org.onosproject.store.service.StorageService;

 import org.onosproject.vtnrsc.AllocationPool;

+import org.onosproject.vtnrsc.DefaultAllocationPool;

 import org.onosproject.vtnrsc.DefaultSubnet;

 import org.onosproject.vtnrsc.HostRoute;

 import org.onosproject.vtnrsc.Subnet;

@@ -89,6 +90,7 @@
                                                  HostRoute.class,

                                                  Subnet.Mode.class,

                                                  AllocationPool.class,

+                                                 DefaultAllocationPool.class,

                                                  DefaultSubnet.class,

                                                  IpAddress.Version.class))

                 .build().asJavaMap();