update make_fbpy_archive.py to replace the output on Windows
update make_fbpy_archive.py to replace the output on Windows

Summary:
Update the code to use `os.replace()` rather than `os.rename()` so that it
won't fail on Windows if the destination path already exists.

Reviewed By: chadaustin

Differential Revision: D17462716

fbshipit-source-id: cbc06319ccb2d73868f80ab1874890ebec5a621b

facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro