new Dash Buttons don't send ARP requests from 0.0.0.0

[mdhoney]

The issue is described here, for example: http://stackoverflow.com/questions/37302925/amazon-dash-button-stopped-arping

The new Dash Buttons no longer ARP request from 0.0.0.0. Instead, they appear to send a DHCP request from 0.0.0.0 instead. Since I'm not sure how to implement this in scapy, I just commented out this line:

if pkt[ARP].psrc == '0.0.0.0'