docs: def avail_images(conn=None, call=None):
      '''
      Return a list of the server appliances that are on the provider
      '''
      if call == 'action':
          raise SaltCloudSystemExit(
              'The avail_images function must be called with '
              '-f or --function, or with the --list-images option'
          )
  
      if not conn:
          conn = get_conn()
  
      ret = {}
  
      for appliance in conn.list_appliances():
          ret[appliance['name']] = appliance
  
      return ret