qa: disable inter-cluster-instance-move for file

This actually hides a real issue that was discovered by enabling
file-based qa, so bug was filed for it. On the other hand it's better
than keeping the qa broken, since this functionality was broken anyway.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michele Tartara <mtartara@google.com>