Comment 4 for bug 1936420

Against this patch https://review.opendev.org/c/openstack/tripleo-heat-templates/+/799981 and
https://b18b498c87a70760171a-55be5aa52ff9f3c19ea7817c824a7dd8.ssl.cf5.rackcdn.com/799981/1/check/tripleo-ci-centos-8-standalone/d4c3fa4/logs/undercloud/var/log/tempest/tempest_run.log

```
{0} tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.test_port_security_macspoofing_port [255.406850s] ... FAILED

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/usr/lib/python3.6/site-packages/tempest/common/utils/__init__.py", line 109, in wrapper
        return func(*func_args, **func_kwargs)
      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_network_basic_ops.py", line 903, in test_port_security_macspoofing_port
        nic=spoof_nic, should_succeed=True)
      File "/usr/lib/python3.6/site-packages/tempest/scenario/manager.py", line 1387, in check_remote_connectivity
        self.fail(msg)
      File "/usr/lib/python3.6/site-packages/unittest2/case.py", line 693, in fail
        raise self.failureException(msg)
    AssertionError: Timed out waiting for 10.100.0.21 to become reachable from 192.168.24.173
```

We are seeing the same issue moving this job to skip list.