vfs_shadow_copy2: in fstat also convert fsp->fsp_name and fsp->base_fsp->fsp_name

vfs_shadow_copy2: in fstat also convert fsp->fsp_name and fsp->base_fsp->fsp_name

Stacked VFS modules might use the file name, not the file
handle. Looking at you, vfs_fruit...

Bug: https://bugzilla.samba.org/show_bug.cgi?id=13455

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
(cherry picked from commit aa1fac696956f96e89e54ddd4535a6e2844161b0)

Autobuild-User(v4-9-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-9-test): Thu Dec 13 16:47:40 CET 2018 on sn-devel-144