[avahi] gnome-vfs avahi support

[Alexander Larsson]

I just commited initial support for Avahi to gnome-vfs HEAD.
It seems to work, although I haven't done any heavy testing.

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 Alexander Larsson                                            Red Hat, Inc 
                   alexl at redhat.com    alla at lysator.liu.se 
He's an immortal shark-wrestling inventor on his last day in the job. She's an 
elegant French-Canadian barmaid operating on the wrong side of the law. They 
fight crime!