GUI2 added in the layout topo overlay

Change-Id: I9960f95ae726a5af9950771ed67bcfc9d172e267
diff --git a/core/api/src/main/java/org/onosproject/ui/model/topo/UiHost.java b/core/api/src/main/java/org/onosproject/ui/model/topo/UiHost.java
index 5ca86e3..10dfbf1 100644
--- a/core/api/src/main/java/org/onosproject/ui/model/topo/UiHost.java
+++ b/core/api/src/main/java/org/onosproject/ui/model/topo/UiHost.java
@@ -52,6 +52,7 @@
         checkNotNull(host, HOST_CANNOT_BE_NULL);
         this.topology = topology;
         this.hostId = host.id();
+        this.regionId = RegionId.regionId(UiRegion.NULL_NAME);
     }
 
     @Override
@@ -60,6 +61,7 @@
                 .add("id", id())
                 .add("dev", locDevice)
                 .add("port", locPort)
+                .add("Region", regionId)
                 .toString();
     }