Add default policy for Gnocchi

PROD-34861

Change-Id: Iedc4605bfa1e3c87909fd1c4731fac77650c861f
diff --git a/defaults/openstack/policy/gnocchi.yml b/defaults/openstack/policy/gnocchi.yml
new file mode 100644
index 0000000..a56e91b
--- /dev/null
+++ b/defaults/openstack/policy/gnocchi.yml
@@ -0,0 +1,6 @@
+classes:
+- system.defaults.openstack.policy.all
+parameters:
+  gnocchi:
+    server:
+      policy: ${_param:gnocchi_default_policy_${_param:openstack_version}}