docs: def get_vm_list(self):
          """Get the list of guests that are created by SDK
          return userid list"""
          action = "list all guests in database"
          with zvmutils.log_and_reraise_sdkbase_error(action):
              guests_in_db = self._GuestDbOperator.get_guest_list()
              guests_migrated = self._GuestDbOperator.get_migrated_guest_list()
  
          # db query return value in tuple (uuid, userid, metadata, comments)
          userids_in_db = [g[1].upper() for g in guests_in_db]
          userids_migrated = [g[1].upper() for g in guests_migrated]
          userid_list = list(set(userids_in_db) - set(userids_migrated))
  
          return userid_list