Support for source and destination for traceNG.

gns3server/controller/node.py

@@ -454,7 +454,7 @@ class Node:
         yield from self.delete()
 
     @asyncio.coroutine
-    def start(self):
+    def start(self, data=None):
         """
         Start a node
         """
@@ -467,7 +467,7 @@ class Node:
                     raise aiohttp.web.HTTPConflict(text="IOU licence is not configured")
                 yield from self.post("/start", timeout=240, data={"iourc_content": licence})
             else:
-                yield from self.post("/start", timeout=240)
+                yield from self.post("/start", data=data, timeout=240)
         except asyncio.TimeoutError:
             raise aiohttp.web.HTTPRequestTimeout(text="Timeout when starting {}".format(self._name))