Windows: File Attribute Reporting Consistency

Do a better job of consistently reporting file attribute information
via directory queries and file information queries.  Avoid computing file
attribute information for file information queries that do not return them
(e.g., Name Information) because computing it is expensive.

Change-Id: I5c8120698261f555edfa98e92230705b593aca36
Reviewed-on: http://gerrit.openafs.org/9613
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>