test/tsx: set grant version for created domains

test/tsx: set grant version for created domains

Set the grant table version for the created domains to use version 1,
as such tests domains don't require the usage of the grant table at
all. A TODO note is added to switch those dummy domains to not have a
grant table at all when possible. Without setting the grant version
the domains for the tests cannot be created.

Fixes: 7379f9e10a ('gnttab: allow setting max version per-domain')
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reported-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Release-Acked-by: Ian Jackson <iwj@xenproject.org>