Add per module policy service refresh

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

Change-Id: I9c4804116384465fbefa419c1158a87ab8b2c872
(cherry picked from commit df8733d486a9c87ad5e8103c45d5b7011e41935e)

manifests/deps.pp

@@ -21,7 +21,7 @@ class watcher::deps {
 
   # policy config should occur in the config block also.
   Anchor['watcher::config::begin']
-  -> Openstacklib::Policy<||>
+  -> Openstacklib::Policy<| tag == 'watcher' |>
   ~> Anchor['watcher::config::end']
 
   # all cache settings should be applied and all packages should be installed

manifests/policy.pp

@@ -67,6 +67,7 @@ class watcher::policy (
     file_group   => $::watcher::params::group,
     file_format  => 'yaml',
     purge_config => $purge_config,
+    tag          => 'watcher',
   }
 
   create_resources('openstacklib::policy', { $policy_path => $policy_parameters })

spec/classes/watcher_policy_spec.rb

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