[PATCH/RFC] added possibility to supply more than one --listen argument to git-daemon

Hi list,

I have written a patch to allow more than one --listen argument to the
git daemon. The current situation is, that the daemon silently ignores
all --listen arguments beside the last one. So there is no possibility
to let on server listen on many addresses without let it bind to all.

Even if that is currently not a problem with ipv4 addresses, in the
future that problem gets even worse. I wanted git-daemon to listen on
an ipv4 address and an ipv6 address. That is currently not possible
without running two instances. So I created that patch.

What do you think?

Thanks,
Alex


PS: This is my first patch for git.git, so please point out if I done
    something technically wrong.