bind9: Add support for clean_zonefile option

The option was added some cycles ago[1].

[1] 7618d073c9ee81cdf835f603e9030f6dd09b6d75

Change-Id: I94f74ca0e2d8d5bdad5787f4b2bcc29de26cadf1

manifests/backend/bind9.pp

@@ -45,6 +45,10 @@
 #  (Optional) TCP Port to connect to designate-mdns service.
 #  Defaults to 5354.
 #
+# [*clean_zonefile*]
+#  (Optional) Removes zone files when a zone is deleted.
+#  Defaults to false
+#
 # [*also_notifies*]
 #  (Optional) Array of hosts for which designate-mdns will send DNS notify
 #  packets to.
@@ -72,6 +76,7 @@ class designate::backend::bind9 (
   $dns_port                         = 53,
   Array[String[1], 1] $mdns_hosts   = ['127.0.0.1'],
   $mdns_port                        = 5354,
+  Boolean $clean_zonefile           = false,
   Array[String[1]] $also_notifies   = [],
   # DEPRECATED PARAMETERS
   Boolean $configure_bind           = true,

releasenotes/notes/bind9-clean_zonefile-811c1b264ea08143.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    The new ``designate::backend::clean_zonefile`` parameter has been added.

templates/bind9-pools.yaml.erb

@@ -33,6 +33,9 @@
         rndc_port: <%= @rndc_port %>
         rndc_config_file: <%= @rndc_config_file %>
         rndc_key_file: <%= @rndc_key_file %>
+<% if @clean_zonefile -%>
+        clean_zonefile: true
+<% end -%>
 <% end -%>
 <% if !(@also_notifies.empty?) -%>
   also_notifies: