Migrate make-manuf to Python+CSV.

Migrate make-manuf to Python+CSV.

The download links offered by the IEEE at
https://standards.ieee.org/products-services/regauth/ are CSV files.
Updating the Perl version to support CSV would have required rewriting a
significant portion of the script along with either adding a dependency
on Text::CSV or writing our own CSV parser.

Migrate it to Python, which has a built-in CSV module.

Change-Id: I39ba0ec873145f44374ab9f751e8bde51535ca4d
Reviewed-on: https://code.wireshark.org/review/29442
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>