Merge branch '2.1' into 2.2

# Conflicts:
#	gns3server/compute/iou/iou_vm.py
#	gns3server/compute/virtualbox/virtualbox_vm.py
#	gns3server/compute/vmware/vmware_vm.py

gns3server/handlers/api/compute/traceng_handler.py

@@ -55,7 +55,8 @@ class TraceNGHandler:
                                             request.match_info["project_id"],
                                             request.json.get("node_id"),
                                             console=request.json.get("console"))
-        vm.ip_address = request.json.get("ip_address", "")  # FIXME, required IP address to create node?
+        vm.ip_address = request.json.get("ip_address", "")
+        vm.default_destination = request.json.get("default_destination", "")
         response.set_status(201)
         response.json(vm)
 
@@ -99,6 +100,7 @@ class TraceNGHandler:
         vm = traceng_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
         vm.name = request.json.get("name", vm.name)
         vm.ip_address = request.json.get("ip_address", vm.ip_address)
+        vm.default_destination = request.json.get("default_destination", vm.default_destination)
         vm.updated()
         response.json(vm)
 
@@ -157,7 +159,7 @@ class TraceNGHandler:
 
         traceng_manager = TraceNG.instance()
         vm = traceng_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
-        yield from vm.start(request.json["destination"])
+        yield from vm.start(request.get("destination"))
         response.json(vm)
 
     @Route.post(