Adding support for GUI TopologyView to visualize port packet stats as an alternative to port byte stats.

Change-Id: I323840c4fe98009759646eed0c4c66fa2bad0e61
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/topo/util/TrafficLink.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/util/TrafficLink.java
index 16d3db7..570fed4 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/topo/util/TrafficLink.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/topo/util/TrafficLink.java
@@ -243,6 +243,11 @@
         PORT_STATS,
 
         /**
+         * Number of packets per second.
+         */
+        PORT_PACKET_STATS,
+
+        /**
          * Custom tagged information.
          */
         TAGGED