While our qemuhotplugtest already does a PCI hotplug and unlpug
("hostdev-pci") there is another way to hotplug a PCI device,
esp. if it's a NIC: <interface type='hostdev'/>. This has been
missing and as shown in v12.1.0-rc1-4-gfe782ed334 can be
potentially dangerous as some different paths are taken.
Introduce a test case for interface-hostdev.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Laine Stump <laine@redhat.com>