Add Apache License line to fsutil

This is probably not the correct apporach to using bsd licensed code under an apache license.
Signed-off-by: Brice Rising <brice.rising@slalom.com>
(cherry picked from commit 55ea6987841b240ce65d6e7231ddb8046b4369c0)

pkg/fsutil/fs.go

 // Copyright 2016 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// license.
+
+// Licensed under the Apache License, Version 2.0 (the "License");
 
 package fs
 

pkg/fsutil/fs_test.go

 // Copyright 2016 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// license.
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+
 
 package fs
 

pkg/fsutil/rename.go

 // Copyright 2016 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// license.
+
+// Licensed under the Apache License, Version 2.0 (the "License");
 
 // +build !windows
 

pkg/fsutil/rename_windows.go

 // Copyright 2016 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// license.
+
+// Licensed under the Apache License, Version 2.0 (the "License");
 
 // +build windows