ONOS-4326: Focusing on add/remove cluster member. (WIP).

If reviewing this, please refer to http://tinyurl.com/onos-ui-topo-model

Change-Id: Ic6568074ac768ec828f9103e92caab5e9a06ade6
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/UiModelEvent.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/UiModelEvent.java
index c37f27d..1a2c66c 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/UiModelEvent.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/UiModelEvent.java
@@ -29,8 +29,12 @@
     }
 
     enum Type {
-        DEVICE_ADDED,
+        CLUSTER_MEMBER_ADDED_OR_UPDATED,
+        CLUSTER_MEMBER_REMOVED,
+
+        DEVICE_ADDED_OR_UPDATED,
         DEVICE_REMOVED,
+
         // TODO...
     }
 }