Add wifi packet parser from apenwarr/wavedroplet

This is needed to parse 802.11ac Radiotap headers. (Well, either this or
Wireshark. And this is smaller.)

Upstream URL: https://raw.githubusercontent.com/apenwarr/wavedroplet/master/wifipacket.py
Upstream rev: b79663445b6ebdcb12386502ac286d94f12ef9e2

Change-Id: Ic1d974f8a46f1f839c4caea4d16c35233f73bb56
1 file changed