storwize ssh_execute always sleeps on failure.

[Gerald McBrearty]

    def _ssh_execute(self, sshpool, command,
                     check_exit_code = True, attempts=1):
        try:
            with sshpool.item() as ssh:
                while attempts > 0:
                    attempts -= 1
                    try:
                        return processutils.ssh_execute(
                            ssh,
                            command,
                            check_exit_code=check_exit_code)
                    except Exception as e:
                        LOG.error(_LE('Error has occurred: %s'), e)
                        last_exception = e
                        greenthread.sleep(self.DEFAULT_GR_SLEEP)
                    try:

If attempts is down to zero (meaning this is the last try) is there a reason to sleep?

[jiamin (shljia)]

it is not recommended to retry immediately after failed, wait for a short time is better, i think this may be the reason.