Windows: Name Array store mount point and volume root

Windows: Name Array store mount point and volume root

Modify the Name Array processing to store both the mount point
object and the volume root directory object in the array.  This
is necessary for proper operation of
AFSPopulateNameArrayFromRelatedArray when the DirectoryCB parameter
is a mount point object.

Modify AFSBackupEntry to remove two entries if a volume root
directory entry is being removed.

Remove AFSReplaceCurrentElement() as it is no longer used.

Change-Id: Iaa0a4effc3448351d04bcdd72be9ee726ffe4e9a
Reviewed-on: http://gerrit.openafs.org/7021
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>