Comment 5 for bug 1921400

We are seeing it in upgrade job:
https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_2da/785195/1/check/tripleo-ci-centos-8-standalone-upgrade-victoria/2da7930/logs/undercloud/var/log/tempest/tempest_run.log
```
{0} tempest.scenario.test_minimum_basic.TestMinimumBasicScenario.test_minimum_basic_scenario [367.974139s] ... FAILED

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/ssh.py", line 113, in _get_ssh_connection
        sock=proxy_chan)
      File "/usr/lib/python3.6/site-packages/paramiko/client.py", line 446, in connect
        passphrase,
      File "/usr/lib/python3.6/site-packages/paramiko/client.py", line 764, in _auth
        raise saved_exception
      File "/usr/lib/python3.6/site-packages/paramiko/client.py", line 664, in _auth
        self._transport.auth_publickey(username, pkey)
      File "/usr/lib/python3.6/site-packages/paramiko/transport.py", line 1580, in auth_publickey
        return self.auth_handler.wait_for_response(my_event)
      File "/usr/lib/python3.6/site-packages/paramiko/auth_handler.py", line 250, in wait_for_response
        raise e
    paramiko.ssh_exception.AuthenticationException: Authentication failed.

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/usr/lib/python3.6/site-packages/tempest/common/utils/__init__.py", line 90, in wrapper
        return f(*func_args, **func_kwargs)
      File "/usr/lib/python3.6/site-packages/tempest/scenario/test_minimum_basic.py", line 151, in test_minimum_basic_scenario
        server=server)
      File "/usr/lib/python3.6/site-packages/tempest/scenario/manager.py", line 638, in get_remote_client
        linux_client.validate_authentication()
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/utils/linux/remote_client.py", line 59, in wrapper
        six.reraise(*original_exception)
      File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise
        raise value
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/utils/linux/remote_client.py", line 32, in wrapper
        return function(self, *args, **kwargs)
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/utils/linux/remote_client.py", line 115, in validate_authentication
        self.ssh_client.test_connection_auth()
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/ssh.py", line 217, in test_connection_auth
        connection = self._get_ssh_connection()
      File "/usr/lib/python3.6/site-packages/tempest/lib/common/ssh.py", line 129, in _get_ssh_connection
        password=self.password)
    tempest.lib.exceptions.SSHTimeout: Connection to the 192.168.24.117 via SSH timed out.
    User: cirros, Password: None
```