Description of problem:
test_floatingip_port_details checks device_owner port field with a hard-coded default value of 'compute:nova'
In case there are custom availability zones the test fails with something like:

Traceback (most recent call last):
File "/usr/lib/python3.9/site-packages/neutron_tempest_plugin/scenario/test_floatingip.py", line 246, in test_floatingip_port_details
self._check_port_details(
File "/usr/lib/python3.9/site-packages/neutron_tempest_plugin/scenario/test_floatingip.py", line 275, in _check_port_details
self.assertEqual(device_owner, port_details['device_owner'])
File "/usr/lib/python3.9/site-packages/testtools/testcase.py", line 391, in assertEqual
self.assertThat(observed, matcher, message)
File "/usr/lib/python3.9/site-packages/testtools/testcase.py", line 478, in assertThat
raise mismatch_error
testtools.matchers._impl.MismatchError: 'compute:nova' != 'compute:ovn-migration-zone-1'

Version-Release number of selected component (if applicable):
RHOS-17.1-RHEL-9-20230925.n.1
python3-neutron-tests-tempest-2.1.0-1.20230508090955.el9ost.noarch

How reproducible:
100% in case availability zones have names different from default compute:nova

Steps to Reproduce:
1. Deploy OSP environment
2. Create custom availability zones (see example below) note: my environment had 4 compute nodes but it's possible to reproduce the same issue with 2 compute nodes as well

openstack aggregate create --zone ovn-migration-zone-0 ovn-migration-agg-0
openstack aggregate add host ovn-migration-agg-0 compute-0.redhat.local
openstack aggregate add host ovn-migration-agg-0 compute-1.redhat.local
openstack aggregate create --zone ovn-migration-zone-1 ovn-migration-agg-1
openstack aggregate add host ovn-migration-agg-1 compute-2.redhat.local
openstack aggregate add host ovn-migration-agg-1 compute-3.redhat.local

After this we have this:
(overcloud) [stack@undercloud-0 tempest_17.1]$ openstack host list
--------------------------------------------------------

--------------------------------------------------------

--------------------------------------------------------

3. run tempest test neutron_tempest_plugin.scenario.test_floatingip.FloatingIPPortDetailsTest.test_floatingip_port_details

Actual results:
test_floatingip_port_details fails when there are custom availability zones
with MismatchError e.g.
testtools.matchers._impl.MismatchError: 'compute:nova' != 'compute:ovn-migration-zone-1'

Expected results:
test_floatingip_port_details is passing even when custom availability zones are configured

Additional info:

For a reference, without custom availability zones config (i.e. by default) this output is as follows:
(overcloud) [stack@undercloud-0 tempest_17.1]$ openstack host list
--------------------------------------------

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