Remove perm change in archive

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)

archive/diff.go

@@ -61,7 +61,7 @@ func ApplyLayer(dest string, layer ArchiveReader) error {
 			parent := filepath.Dir(hdr.Name)
 			parentPath := filepath.Join(dest, parent)
 			if _, err := os.Lstat(parentPath); err != nil && os.IsNotExist(err) {
-				err = os.MkdirAll(parentPath, 0700)
+				err = os.MkdirAll(parentPath, 0600)
 				if err != nil {
 					return err
 				}