Allow supplying filename and paths with '**' recursive glob matches
to zuul-swift-upload. Since bash (or shell etc) will expand on any
filenames provided to the program this needs to be used in quotes.
Usage example:
./zuul_swift_upload.py my_results.txt '**/sdist/*.zip' output.log
The hierarchy is always flattened meaning the supplied list is
placed in the topmost generated index.html. Sub-folders still keep
their hierarchy.
Change-Id: I9ba04f7e46b579dcf3f8ad0bd188f41fa5dbcad9
3691476925