Use BIND 9 server instead of Cloudfl. for DNS-01 challenge via nsupdate

Co-authored-by: Jannik Beyerstedt <code@jannikbeyerstedt.de>

playbooks/roles/cert/meta/argument_specs.yml

@@ -22,16 +22,11 @@ argument_specs:
         description: E-Mail address for ACME account
         required: true
         type: str
-      cert__cloudflare_dns:
-        description: Cloudflare DNS API details
+      cert__bind_9_host:
+        description: The machine running BIND 9.
         required: true
-        type: dict
-        options:
-          api_token:
-            description: Cloudflare API token
-            required: true
-            type: str
-          zone:
-            description: DNS zone the domain is in
-            required: true
-            type: str
+        type: str
+      cert__bind_9_zone:
+        description: The zone to use for publishing the TXT record.
+        required: true
+        type: str