Fix tests after merge

gns3server/compute/docker/docker_vm.py

@@ -489,7 +489,8 @@ class DockerVM(BaseNode):
             params["HostConfig"]["Mounts"].append({
                 "Type": "bind",
                 "Source": f"/tmp/.X11-unix/X{self._display}",
-                "Target": f"/tmp/.X11-unix/X{self._display}"
+                "Target": f"/tmp/.X11-unix/X{self._display}",
+                "ReadOnly": True
             })
 
         if self._extra_hosts:

gns3server/controller/__init__.py

@@ -270,7 +270,7 @@ class Controller:
                 log.error(f"Cannot read IOU license file '{iourc_path}': {e}")
         self._iou_license_settings["license_check"] = iou_config.license_check
 
-        previous_version = controller_settings.get("version")
+        previous_version = controller_vars.get("version")
         log.info("Comparing controller version {} with config version {}".format(__version__, previous_version))
         if not previous_version or \
                 parse_version(__version__.split("+")[0]) > parse_version(previous_version.split("+")[0]):