Add pillars with default policy configuration for OS services

PROD-34318

Change-Id: I46dee301c78450b2aa7a6430de1f3432756688d8
diff --git a/horizon/server/plugin/heat.yml b/horizon/server/plugin/heat.yml
index 909da66..6a1bcb0 100644
--- a/horizon/server/plugin/heat.yml
+++ b/horizon/server/plugin/heat.yml
@@ -1,3 +1,5 @@
+classes:
+- system.defaults.openstack.policy.all
 parameters:
   horizon:
     server:
@@ -8,6 +10,6 @@
             name: python-heat-dashboard
       policy:
         orchestration:
+          source: pillar
+          pillar: ${_param:heat_default_policy_${_param:openstack_version}}
           enabled: true
-          name: heat_policy.json
-          source: file