net/py-macaddress: New port

This Python module is used for handling hardware identifiers like MAC
addresses and makes it easy to:

• check if a string represents a valid MAC address, or a similar hardware identifier like an EUI-64, OUI, etc,
• convert between string and binary forms of MAC addresses and other hardware identifiers,

and so on.

Heavily inspired by the ipaddress module, but not yet quite as
featureful.