Windows: AFSLocateNameEntry tracking DirectoryCB IN/OUT

Windows: AFSLocateNameEntry tracking DirectoryCB IN/OUT

AFSLocateNameEntry previously accepted ParentDirectoryCB as an IN/OUT
parameter in which a reference count was passed in but a reference
count was not passed back out.  The DirectoryCB parameter is an OUT
parameter for which a reference count should be returned on success.

This patchset simplifies the logic.  ParentDirectoryCB is IN only
and OutParentDirectoryCB and DirectoryCB are out only.  AFSLocateNameEntry
never releases a reference count provided by the caller and it always
returns OutParentDirectoryCB and DirectoryCB with a new reference count
unless they are NULL.  It is the callers responsibility to determine if
ParentDirectoryCB has changed and to release all of the references.

Change-Id: I4843d1d685917fd3f41409d0b11f5b768c2c1dd6
Reviewed-on: http://gerrit.openafs.org/9087
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>