code: def get_storage_config_file(self):
          
          if self.alternative_config_dir:
              file = os.path.join(self.alternative_config_dir, self.STORAGE_CONFIG_FILE)
              if os.path.isfile(file):
                  return file
  
              file = os.path.join(self.alternative_config_dir, self.STORAGE_JSON_CONFIG_FILE)
              if os.path.isfile(file):
                  return file
  
          file = os.path.join(self.default_config_dir, self.STORAGE_CONFIG_FILE)
          if os.path.isfile(file):
              return file
  
          file = os.path.join(self.default_config_dir, self.STORAGE_JSON_CONFIG_FILE)
          if os.path.isfile(file):
              return file
  
          raise ControllerConfigurationException('Storage configuration file not found')
docs: Returns the configuration file for the storage.
          :return: