GUI -- Base Cluster View implemented. Bug fixed of table bodies not being wide enough.

Change-Id: Iebf43c87c91404eb443ae1a098b56575ca9959fe
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java b/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
index 469287e..080f5e3 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
@@ -61,6 +61,7 @@
                                     new UiView("host", "Hosts"),
                                     new UiView("app", "Applications"),
                                     new UiView("intent", "Intents"),
+                                    new UiView("cluster", "Cluster Nodes"),
                                     new UiView("sample", "Sample"));
         UiMessageHandlerFactory messageHandlerFactory =
                 () -> ImmutableList.of(
@@ -68,7 +69,8 @@
                         new DeviceViewMessageHandler(),
                         new HostViewMessageHandler(),
                         new ApplicationViewMessageHandler(),
-                        new IntentViewMessageHandler()
+                        new IntentViewMessageHandler(),
+                        new ClusterViewMessageHandler()
                 );
         return new UiExtension(coreViews, messageHandlerFactory, "core",
                                UiExtensionManager.class.getClassLoader());