code: def _rename_nvram_file(self):
          
  
          destination = self._nvram_file()
          for file_path in glob.glob(os.path.join(glob.escape(self.working_dir), "nvram_*")):
              shutil.move(file_path, destination)
          destination = os.path.join(self.working_dir, "vlan.dat-{:05d}".format(self.application_id))
          for file_path in glob.glob(os.path.join(glob.escape(self.working_dir), "vlan.dat-*")):
              shutil.move(file_path, destination)
docs: Before starting the VM, rename the nvram and vlan.dat files with the correct IOU application identifier.