Allow root execute permission if someone is allowed execute

For mode check, test is simple. If any mode set has execute
then root is allowed to execute.

For ACL check, if we are looking for execute permission for root,
we walk the ACL, and consider ANY ACE as applicable, however, we
then ignore a DENY ACE.

Signed-off-by: Frank Filz <ffilz@us.ibm.com>