Don't emit log for missing attribute check policy

A missing policy for validating whether an attribute should
be visible or not is a perfectly normal condition, and
there is no value in logging it.

Writing this information to the log is also having a
considerable performance impact on list operations.

Change-Id: Ie9d3ae6b249a5c49f6d81c1e56915174d8479a07
Closes-Bug: 1302467
(cherry picked from commit ef01fb553a141c012c8d8600edd6b709c5807111)
Merge "Don't emit log for missing attribute check policy" into stable/havana