Add pillars with default policy configuration for OS services

PROD-34318

Change-Id: I46dee301c78450b2aa7a6430de1f3432756688d8
diff --git a/horizon/server/plugin/telemetry.yml b/horizon/server/plugin/telemetry.yml
index a944111..8f62b0e 100644
--- a/horizon/server/plugin/telemetry.yml
+++ b/horizon/server/plugin/telemetry.yml
@@ -1,3 +1,5 @@
+classes:
+- system.defaults.openstack.policy.all
 parameters:
   _param:
     horizon_telemetry_engine: graphite
@@ -19,3 +21,8 @@
         horizon_overrides:
           overrides:
           - horizon_telemetry
+      policy:
+        telemetry:
+          enabled: true
+          source: pillar
+          pillar: ${_param:telemetry_default_policy_${_param:openstack_version}}