tests: add test for presence of 'osv.version' property

This feature was introduced in commit 7bd655ab918eb5cd0bf9f690bfe32066acd6c5f9

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>