vmexit.c: Fix typos in vmexit test-cases list

Some test-case names were different from arguments passing by
unittests.cfg.
So, these cases didn't PASS really.

Signed-off-by: Serg Titaevskiy <stitaevskiy@virtuozzo.com>
Message-Id: <1506512498-27529-1-git-send-email-stitaevskiy@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>