The return from LUVerifyCluster should be True (or equivalent) for pass,
and False (or equivalent) for fail. The HooksCallBack function uses '1'
(= True) when a hook fails, which is exactly the opposite of what we
want - it will make failed hooks to reset the result to success,
overriding actual failures in cluster verify.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>