Fix issue when running multiple project containing IOU nodes on the same server. Ref #1239.

gns3server/handlers/api/compute/iou_handler.py

@@ -65,6 +65,8 @@ class IOUHandler:
 
         for name, value in request.json.items():
             if hasattr(vm, name) and getattr(vm, name) != value:
+                if name == "application_id":
+                    continue  # we must ignore this to avoid overwriting the application_id allocated by the IOU manager
                 if name == "startup_config_content" and (vm.startup_config_content and len(vm.startup_config_content) > 0):
                     continue
                 if name == "private_config_content" and (vm.private_config_content and len(vm.private_config_content) > 0):
@@ -116,6 +118,8 @@ class IOUHandler:
 
         for name, value in request.json.items():
             if hasattr(vm, name) and getattr(vm, name) != value:
+                if name == "application_id":
+                    continue  # we must ignore this to avoid overwriting the application_id allocated by the IOU manager
                 setattr(vm, name, value)
 
         if vm.use_default_iou_values: