Comment 1 for bug 1943708

Failure trace from:

https://logserver.rdoproject.org/openstack-periodic-integration-main/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-8-standalone-full-tempest-scenario-master/ae5ef20/logs/undercloud/var/log/tempest/stestr_results.html.gz

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/neutron_tempest_plugin/scenario/test_trunk.py", line 266, in test_trunk_subport_lifecycle
    self.client.add_subports(vm2.trunk['id'], subports)
  File "/usr/lib/python3.6/site-packages/neutron_tempest_plugin/services/network/json/network_client.py", line 848, in add_subports
    return self._subports_action('add_subports', trunk_id, subports)
  File "/usr/lib/python3.6/site-packages/neutron_tempest_plugin/services/network/json/network_client.py", line 842, in _subports_action
    resp, body = self.put(uri, jsonutils.dumps({'sub_ports': subports}))
  File "/usr/lib/python3.6/site-packages/tempest/lib/common/rest_client.py", line 363, in put
    return self.request('PUT', url, extra_headers, headers, body, chunked)
  File "/usr/lib/python3.6/site-packages/tempest/lib/common/rest_client.py", line 703, in request
    self._error_checker(resp, resp_body)
  File "/usr/lib/python3.6/site-packages/tempest/lib/common/rest_client.py", line 824, in _error_checker
    raise exceptions.Conflict(resp_body, resp=resp)
tempest.lib.exceptions.Conflict: Conflict with state of target resource
Details: {'type': 'PortInUse', 'message': 'Unable to complete operation on port 3dd247b0-6c4e-4f02-85d5-62230d8ccaff for network b8ad6344-a87c-4373-88b9-f6f13175e3bd. Port already has an attached device 41aa6ab0-23b1-418e-9678-6c2fd0da0d46.', 'detail': ''}