Deprecating old web-socket stuff and adding ability for client-side message handler registration. Failover still to be done and same for the async hooks.

Change-Id: I6029c91eb1a04e01401e495b9673ddaea728e215
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/GuiWebSocketServlet.java b/web/gui/src/main/java/org/onosproject/ui/impl/GuiWebSocketServlet.java
index 5a660e0..bc105df 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/GuiWebSocketServlet.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/GuiWebSocketServlet.java
@@ -31,6 +31,7 @@
 /**
  * Web socket servlet capable of creating various sockets for the user interface.
  */
+@Deprecated
 public class GuiWebSocketServlet extends WebSocketServlet {
 
     private static final long PING_DELAY_MS = 5000;