allow-update in global options (was Re: bind and certbot with dns-challenge)

[Stephan von Krawczynski]

Please let me re-phrase the above suggestion to:
 
zone-default "default1" { type master; allow-update { 127.0.0.1; }; };
zone-default "default-slave" { type slave; masters { 10.0.0.1; 10.0.0.2; }; };

zone "mytest.domain" { default1; file "a_zone_file_for_mytest.domain"; };
zone "our-slave.domain" { default-slave; file "just_some_domain.bak"; };

It seems more accurate to name a new keyword "zone-default" instead of
including the new feature into the "zone" statement. This way it is absolutely
clear that it is no real zone, but a collection of options for some zone yet
to come later on.

-- 
Regards,
Stephan von Krawczynski