ONOS-2848 Fix bug of DefaultHostRoute is not registered.

Change-Id: I5e74be707e98677d491893f432ee48f288f23d28
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 9238257..43ab747 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
@@ -29,6 +29,7 @@
 import org.onosproject.store.service.StorageService;

 import org.onosproject.vtnrsc.AllocationPool;

 import org.onosproject.vtnrsc.DefaultAllocationPool;

+import org.onosproject.vtnrsc.DefaultHostRoute;

 import org.onosproject.vtnrsc.DefaultSubnet;

 import org.onosproject.vtnrsc.HostRoute;

 import org.onosproject.vtnrsc.Subnet;

@@ -88,6 +89,7 @@
                                                  TenantNetworkId.class,

                                                  TenantId.class,

                                                  HostRoute.class,

+                                                 DefaultHostRoute.class,

                                                  Subnet.Mode.class,

                                                  AllocationPool.class,

                                                  DefaultAllocationPool.class,