italc-launcher patch for avoiding duplicate entries

[Alkis Georgopoulos]

When italc-launcher is ran from the LTSP server, each client is
autodetected twice. That's because avahi-publish publishes the service
to all the server nics, so the same user is published for both eth0 and
eth1.

Attached is a proposed patched version of italc-launcher (based on
italc-master 1:1.0.9.1-0ubuntu13~ppa1) which fixes the problem by
listening only on the nic that the first client is autodetected on.
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