avahi-autoipd: only consider ARP Probe packets
avahi-autoipd: only consider ARP Probe packets

during the probe phase avahi-autoipd must only select a new IP when
it receives an ARP Probe packet:

According to RFC3927, Section 2.2.1. Probe details:
> An ARP Request constructed this way with an all-zero 'sender IP 
> address' is referred to as an "ARP Probe".

and

> In addition, if during this period [checking if an address is already 
> in use] the host receives any ARP Probe where the packet's 'target IP
> address' is the address being probed for, and the packet's 'sender
> hardware address' is not the hardware address of the interface the
> host is attempting to configure, then the host MUST similarly treat
> this as an address conflict and select a new address as above.

When receiving an ARP packet during probe avahi-autoipd did not check
if the 'sender IP address' is all-zero and therefore if the packet is an
ARP Probe.
heftig/avahi,lathiat/avahi,heftig/avahi-1,heftig/avahi,heftig/avahi-1,heftig/avahi,lathiat/avahi,heftig/avahi,lathiat/avahi,lathiat/avahi,heftig/avahi-1,heftig/avahi-1,lathiat/avahi,heftig/avahi,heftig/avahi-1,lathiat/avahi,heftig/avahi-1,heftig/avahi