Add per module policy service refresh

Updating the policies for this project should only
refresh the services that reads it.

Change-Id: Iaf0bae66224d568a2a05f4ac5281c36bde2705e0

manifests/deps.pp

@@ -41,7 +41,7 @@ class placement::deps {
 
   # policy config should occur in the config block also.
   Anchor['placement::config::begin']
-  -> Openstacklib::Policy<||>
+  -> Openstacklib::Policy<| tag == 'placement' |>
   ~> Anchor['placement::config::end']
 
   # On any uwsgi config change, we must restart Placement.

manifests/policy.pp

@@ -65,6 +65,7 @@ class placement::policy (
     file_group   => $::placement::params::group,
     file_format  => 'yaml',
     purge_config => $purge_config,
+    tag          => 'placement',
   }
 
   create_resources('openstacklib::policy', { $policy_path => $policy_parameters })

spec/classes/placement_policy_spec.rb

@@ -33,6 +33,7 @@ describe 'placement::policy' do
           :file_group   => 'placement',
           :file_format  => 'yaml',
           :purge_config => false,
+          :tag          => 'placement',
         )
         is_expected.to contain_oslo__policy('placement_config').with(
           :enforce_scope        => false,
@@ -63,6 +64,7 @@ describe 'placement::policy' do
           :file_group   => 'placement',
           :file_format  => 'yaml',
           :purge_config => true,
+          :tag          => 'placement',
         )
         is_expected.to contain_oslo__policy('placement_config').with(
           :enforce_scope        => false,