vfs_fruit: Time Machine/FULLSYNC: add mDNS/DNS-SD advertisement

[Ralph Böhme]

On Fri, Jul 21, 2017 at 11:00:29PM -0700, Omri Mor wrote:
> Alright, I’ve started work on an initial patch (to Kevin Anderson’s patch).
> 
> There was a bit of discussion on GitHub: Recently (259e170) a fruit:model
> option was introduced to configure what Samba sends for the AAPL_MODEL_INFO
> extension.  Apple also uses the _device-info._tcp advertisement for the same
> purpose.  The main effect of both is what icon is used in Finder, with
> _device-info._tcp taking priority.  Should I also configure that
> advertisement? I don’t know if it matters much either way.

afaict the device info advertisement is not required for TM, so we should
probably keep it out of this patchset.

-slow