Check device_owner with actual availability zone

test_floatingip_port_details was checking device_owner port field
against a hard-coded default value of 'compute:nova'. This was
causing a MismatchError in case custom availability zones were
configured on openstack environment.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2247268
Closes-Issue: PRODX-48251
Change-Id: Ibdb8bf6f90818c74f1198cd89d24778c74739f50
1 file changed