HEADS UP: named now runs chroot'ed by default

[Gregory Neil Shapiro]

> The simplest answer is that not every host can burn (or even obtain) an 
> extra IP address for the jail. It's also questionable what additional 
> benefit would be obtained.
> 
> Of course, if someone else finds the time to implement this, I will give 
> it a serious look. I'm not _opposed_ to the idea.

If someone does so, please make it optional as jails don't support
IPv6 yet and BIND 9 does.