Today qemu is using e.g. the value 480 for Xen version 4.8.0. As some
Xen version tests are using ">" relations this scheme will lead to
problems when Xen version 4.10.0 is being reached.

Instead of the 3 digit schem use a 5 digit scheme (e.g. 40800 for
version 4.8.0).
Signed-off-by: NJuergen Gross <jgross@suse.com>
Signed-off-by: NStefano Stabellini <sstabellini@kernel.org>
Reviewed-by: NStefano Stabellini <sstabellini@kernel.org>