Add code to probe properties of 'scsi-block' and 'scsi-generic' qemu
devices. For now the '.replies' are modified using the
'qemu-replies-tool' script and the data is annotated as fake and is in
fact missing. Further updates will populate them for any real dump.
The properties for the two devices will be later used e.g. to detect
support for persistent reservations migration support.
Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>