docs/interop: Add test to keep vhost-user.json sane

We did this for firmware.json in commit d4181658dfb (docs: add test
for firmware.json QAPI).

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-ID: <20251103082354.3273027-10-armbru@redhat.com>
1 file changed