[Samba] Why is S4 attempting to execute rndc when using *INTERNAL* DNS?

[Adam Williams]

On Sat, 2017-01-14 at 07:31 +1300, Andrew Bartlett wrote:
> On Fri, 2017-01-13 at 13:07 -0500, Adam Tauno Williams via samba
> wrote:
> > My AD domain (SerNET S4 4.5.3) using S4's internal DNS, and always 
> > has.  So why is it now constantly logging an error of -
> >    [2017/01/13 12:53:00.152754,  0]  
> > ../lib/util/util_runcmd.c:316(samba_runcmd_io_handler)
> >      /usr/sbin/rndc: Failed to exec child - No such file or
> > directory
> >   - after attempting to add a 2008R2 DC.  I do not recall seeing
> > this  error previously [not prior to 4.5.3].
> I don't think this area has changed recently, but perhaps we now 
> catch the error better.  I agree, this is a bit silly - it is writing 
> out a config file for bind 9.7, ie before we had the DLZ code.
> The whole thing needs to be removed - those running bind9 with the
> flatfile backend are unsupported anyway and probably don't want Samba
> dynamically updating configuration entries - they want things locked
> down.

But it should not prevent anything from working?