test: Add new SimpleDisk test
test: Add new SimpleDisk test

This test is meant for adding CDROM, floppy and disk to a domain.
For now, each method has _file and _device variant, which are
tested for now.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

libvirt/libvirt-designer,libvirt/libvirt-designer