Merge branch 'obsolete-bind-options' into 'master'

Drop Bind9 options that are obsolete in bullseye

Closes prod#250

See merge request !226

roles/float-infra-dns/templates/bind/named.conf.local

@@ -8,8 +8,10 @@ view "internal-in" in {
 {% endfor %}
   };
   recursion yes;
+{% if float_debian_dist == 'buster' %}
   additional-from-auth yes;
   additional-from-cache yes;
+{% endif %}
   zone-statistics no;
 
   // Send minimal responses, to avoid problems with the Spamassassin
@@ -31,11 +33,13 @@ view "external-in" in {
   recursion no;
   zone-statistics yes;
 
+{% if float_debian_dist == 'buster' %}
   // Do not trust the cache when generating additional records
   // for our authoritative zones.
   additional-from-auth no;
   additional-from-cache no;
 
+{% endif %}
   // Include manually-maintained zones.
   include "/etc/bind/named.conf.external-custom-zones";
 

roles/float-infra-dns/templates/bind/named.conf.options

@@ -28,7 +28,9 @@ options {
   listen-on-v6 { any; };
 {% endif %}
 
+{% if float_debian_dist == 'buster' %}
   dnssec-enable yes;
+{% endif %}
   dnssec-validation auto;
 
   notify no;