Oops! Fix updateLink() function in topology view.
(also add linkupdate scenario).

Change-Id: Ic0f6753745e43c5fc76a6cb180a0c8a66178c657
diff --git a/web/gui/src/test/_karma/ev/linkupdate/ev_3_addDevice_B.json b/web/gui/src/test/_karma/ev/linkupdate/ev_3_addDevice_B.json
new file mode 100644
index 0000000..8dd7143
--- /dev/null
+++ b/web/gui/src/test/_karma/ev/linkupdate/ev_3_addDevice_B.json
@@ -0,0 +1,18 @@
+{
+  "event": "addDevice",
+  "payload": {
+    "id": "of:000000000000000b",
+    "type": "switch",
+    "online": true,
+    "master": "onos",
+    "labels": [
+      "",
+      "sw-B",
+      "000000000000000b"
+    ],
+    "metaUi": {
+      "x": 500,
+      "y": 310
+    }
+  }
+}