Use uBridge for VirtualBox connections plus some cleaning. Ref #267.

gns3server/handlers/api/compute/ethernet_switch_handler.py

@@ -218,7 +218,7 @@ class EthernetSwitchHandler:
 
         #builtin_manager = Builtin.instance()
         #node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
-        #nio = yield from builtin_manager.create_nio(node, request.json["nio"])
+        #nio = yield from builtin_manager.create_nio(request.json["nio"])
 
         response.set_status(201)
         response.json(nio)