Windows: LocateName skip DFS Link only last component

As with Mount Points and Symlinks, when AFSLocateName() is called to
process a CreateFile with Open_Reparse_Point enabled, DFS Link processing
must be disabled only for the last component in the path.  Failure to
do so results in the AFS Redirector succeeding IRP_MJ_CREATE calls that
should be given back to the IO Manager so the path can be evaluated by
another file system.

Change-Id: I1627e7c6582d3a80d99dd2acc5171135a6a7bc4b
Reviewed-on: http://gerrit.openafs.org/11398
Reviewed-by: Peter Scott <pscott@kerneldrivers.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>