code: def listMigrationBlocks(self, migration_request_id=""):
          
  
          conn = self.dbi.connection()
          try:
              return self.mgrblklist.execute(conn, migration_request_id=migration_request_id)
          finally:
              if conn: conn.close()
docs: get eveything of block that is has status = 0 and migration_request_id as specified.