Create file/dir over whiteout by another user, uid/gid of the
file/dir should be current fsuid/fsgid, not the mounter's.
This upstream kernel patch fixed the issue
d0e13f5 ovl: fix uid/gid when creating over whiteout
Reviewed-by: Xiong Zhou <xzhou@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>