tests,test-gconfig: Check _domain_os_get_machine()
tests,test-gconfig: Check _domain_os_get_machine()

Let's add one more simple check for gvir_config_domain_os_get_machine().

Signed-off-by: Fabiano Fidêncio <2931bae082ef9bc04523ba759c03a4778316d48f@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

libvirt/libvirt-glib,libvirt/libvirt-glib,libvirt/libvirt-glib