Add "listen" option from group "service:agent"

Change-Id: I4bc6af4e88328c305feb52f1c4a3ffa1f3db0684

manifests/agent.pp

@@ -24,18 +24,24 @@
 #  (optional) Driver used for backend communication (fake, rpc, bind9, powerdns)
 #  Defaults to 'bind9'
 #
+# [*listen*]
+#  (optional) Agent host:port pairs to listen on.
+#  Defaults to $::os_service_default
+#
 class designate::agent (
   $package_ensure     = present,
   $agent_package_name = $::designate::params::agent_package_name,
   $enabled            = true,
   $service_ensure     = 'running',
   $backend_driver     = 'bind9',
+  $listen             = $::os_service_default,
 ) inherits designate {
 
   include ::designate::deps
 
   designate_config {
     'service:agent/backend_driver' : value => $backend_driver;
+    'service:agent/listen' :         value => $listen;
   }
 
   designate::generic_service { 'agent':

releasenotes/notes/add_agent_listen_option-2396135a25d97f13.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Add "listen" option from group "service:agent".

spec/classes/designate_agent_spec.rb

@@ -29,6 +29,7 @@ describe 'designate::agent' do
 
       it 'configures designate-agent with default parameters' do
         is_expected.to contain_designate_config('service:agent/backend_driver').with_value('bind9')
+        is_expected.to contain_designate_config('service:agent/listen').with_value('<SERVICE DEFAULT>')
       end
 
       context 'when using Power DNS backend driver' do
@@ -52,6 +53,17 @@ describe 'designate::agent' do
         )
       end
     end
+
+    context 'with overriding parameters' do
+      before do
+        params.merge!({ :listen => '127.0.0.1:9002' })
+      end
+
+      it 'configures designate-agent with custom parameters' do
+        is_expected.to contain_designate_config('service:agent/listen').with_value( params[:listen] )
+      end
+    end
+
   end
 
   on_supported_os({