Sketching out request/showTraffic interactions between GUI server/client.

Change-Id: I78dfe0da6a7b4e03972a8ef11190101614d81a63

 {
-  "event": "showPath",
+  "event": "showTraffic",
   "sid": 1,
   "payload": {
-    "intentId": "0x1234",
-    "path": {
-      "links": [ "1-2", "2-3" ],
-      "traffic": false
-    }
+    "paths": [
+      {
+        "intentId": "0x1234",
+        "links": [ "1-2", "2-3" ],
+        "class": "primary"
+      },
+      {
+        "intentId": "0x4321",
+        "links": [ "5-6", "6-7" ],
+        "class": "secondary"
+      }
+    ]
   }
 }

 {
-  "event": "monitorIntent",
+  "event": "requestTraffic",
   "sid": 2,
   "payload": {
-    "intentId": "0x1234"
+    "ids": [ "00:00:00:00:00:01/-1",  "00:00:00:00:00:02/-1" ]
   }
 }

@@ -2,12 +2,19 @@
   "event": "showPath",
   "sid": 2,
   "payload": {
-    "intentId": "0x1234",
-    "path": {
-      "links": [ "1-2", "2-3" ],
-      "traffic": true,
-      "srcLabel": "567 Mb",
-      "dstLabel": "6 Mb"
-    }
+    "paths": [
+      {
+        "intentId": "0x1234",
+        "links": [ "1-2", "2-3" ],
+        "class": "animated",
+        "labels": [ "9Gb", "9Gb" ]
+      },
+      {
+        "intentId": "0x4321",
+        "links": [ "5-6", "6-7" ],
+        "class": "animated",
+        "traffic": [ "4GB", "4GB" ]
+      }
+    ]
   }
 }

 {
-  "event": "showPath",
+  "event": "showTraffic",
   "sid": 2,
   "payload": {
-    "intentId": "0x1234",
-    "path": {
-      "links": [ "1-2", "2-3" ],
-      "traffic": true,
-      "srcLabel": "967 Mb",
-      "dstLabel": "65 Mb"
-    }
+    "paths": [
+      {
+        "intentId": "0x1234",
+        "links": [ "1-2", "2-3" ],
+        "class": "animated",
+        "labels": [ "17Gb", "16Gb" ]
+      },
+      {
+        "intentId": "0x4321",
+        "links": [ "5-6", "6-7" ],
+        "class": "animated",
+        "labels": [ "9Gb", "5Gb" ]
+      }
+    ]
   }
 }

 {
-  "event": "showPath",
+  "event": "showTraffic",
   "sid": 2,
   "payload": {
-    "intentId": "0x1234",
-    "path": {
-      "links": [ "1-2", "2-3" ],
-      "traffic": false
-    }
+    "paths": [
+      {
+        "intentId": "0x1234",
+        "links": [ "1-2", "2-3" ],
+        "class": "primary",
+        "labels": [ "17Gb", "16Gb" ]
+      },
+      {
+        "intentId": "0x4321",
+        "links": [ "5-6", "6-7" ],
+        "class": "secondary",
+        "labels": [ "9Gb", "5Gb" ]
+      }
+    ]
   }
 }

 {
-  "event": "cancelMonitorIntent",
+  "event": "cancelTraffic",
   "sid": 3,
   "payload": {
-    "intentId": "0x1234"
   }
 }

+{
+  "event": "showTraffic",
+  "sid": 3,
+  "payload": {
+    "paths": []
+  }
+}