docs: def rados_df(self,
                   host_list=None,
                   remote_user=None,
                   remote_pass=None):
          '''
          Invoked the rados df command and return output to user
          '''
          result, failed_hosts = self.runner.ansible_perform_operation(
              host_list=host_list,
              remote_user=remote_user,
              remote_pass=remote_pass,
              module="command",
              module_args="rados df")
  
          parsed_result = self.rados_parse_df(result)
  
          return parsed_result