Don't lose the addresses for interfaces.

Don't lose the addresses for interfaces.

pcap_add_if() doesn't add addresses; instead of the existing sort code
called by pcap_findalldevs(), change the code for inserting interfaces
into the list to use a "figure of merit" that takes the running, up, and
loopback bits into account, as well as the number from the interface
name, rather than just the interface name, into account.