Various mostly bonjour related fixes

[Mark Doliner]

On Tue, Nov 29, 2011 at 5:09 PM, Ethan Blanton <elb at psg.com> wrote:
*snip*
> I have applied patches 1, 3,
> and 4.  Patch 2 (fix socket listen address) requires a minor version
> bump, as it adds API.  This is by no means a showstopper, but I think
> we want to decide whether to push 2.10.1 out first or not; we've been
> spinning on it for far too long now.
*snip*
> I went ahead and pushed them so that they can get more testing.

I guess I'd prefer if we didn't commit these to 2.x.y.  Supporting
ipv6 for bonjour doesn't seem critical to me.