Description of problem:
Tempest test: test_create_update_port_with_dns_domain failed.

Traceback:
2022-09-21 15:03:32,837 183447 DEBUG [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: {"port": {"network_id": "78677eaf-101d-4226-9d03-4e814a61ef67", "dns_name": "d1", "dns_domain": "test.org."}}
    Response - Headers: {'content-type': 'application/json', 'content-length': '885', 'x-openstack-request-id': 'req-9abfaa44-e7f1-4c00-8003-a24a988939ee', 'date': 'Wed, 21 Sep 2022 15:03:32 GMT', 'connection': 'close', 'status': '201', 'content-location': 'http://192.168.24.3:9696/v2.0/ports'}
        Body: b'{"port":{"id":"1cbb7c1e-e764-43c0-b172-e2a8b89005ee","name":"","network_id":"78677eaf-101d-4226-9d03-4e814a61ef67","tenant_id":"2a13c5ec235e456fa6263d48c97c7eba","mac_address":"fa:16:3e:0e:3a:0c","admin_state_up":true,"status":"DOWN","device_id":"","device_owner":"","fixed_ips":[{"subnet_id":"11b92ce6-1eaa-495d-9899-e06f817e864d","ip_address":"10.100.0.44"}],"project_id":"2a13c5ec235e456fa6263d48c97c7eba","qos_policy_id":null,"port_security_enabled":true,"security_groups":["22659cde-cc48-437d-b829-9b6832992822"],"binding:vnic_type":"normal","allowed_address_pairs":[],"extra_dhcp_opts":[],"description":"","qos_network_policy_id":null,"dns_name":"d1","dns_assignment":[{"ip_address":"10.100.0.44","hostname":"d1","fqdn":"d1.openstackgate.local."}],"ip_allocation":"immediate","tags":[],"created_at":"2022-09-21T15:03:32Z","updated_at":"2022-09-21T15:03:32Z","revision_number":1}}'
}}}

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/tempest/common/utils/__init__.py", line 89, in wrapper
    return func(*func_args, **func_kwargs)
  File "/usr/lib/python3.9/site-packages/neutron_tempest_plugin/api/test_ports.py", line 119, in test_create_update_port_with_dns_domain
    self.assertEqual('test.org.', body['dns_domain'])
KeyError: 'dns_domain'

Logs:
- https://logserver.rdoproject.org/65/41465/12/check/periodic-tripleo-ci-centos-9-standalone-full-tempest-api-network-wallaby/eaaf445/logs/undercloud/var/log/tempest/stestr_results.html.gz
- https://logserver.rdoproject.org/openstack-component-network/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-9-standalone-full-tempest-api-network-wallaby/d2ff917/logs/undercloud/var/log/tempest/stestr_results.html.gz
- https://logserver.rdoproject.org/65/41465/13/check/periodic-tripleo-ci-centos-9-standalone-full-tempest-api-network-wallaby/4bb1839/logs/undercloud/var/log/tempest/stestr_results.html.gz


How reproducible:
Always in 17.0 with test test_create_update_port_with_dns_domain


Steps to Reproduce:
Running test test_create_update_port_with_dns_domain in jobs like periodic-tripleo-ci-rhel-9-standalone-full-tempest-api-network-rhos-17 or periodic-tripleo-ci-rhel-9-standalone-full-tempest-api-rhos-17, currently the test is skipped

Actual results:
Tests fails

Expected results:
Test should pass

Additional info:
Required to backport https://review.opendev.org/q/I25f75d7bd8864ea132246cea79e073232d664d76 to 17.0