Static grain for keystone_policy is not needed

As there's keystone_policy dynamic grain.

Change-Id: If211a2646ac66e202c0b279a9ece0a423c78e459
diff --git a/keystone/meta/salt.yml b/keystone/meta/salt.yml
index 7eccacc..1bb764d 100644
--- a/keystone/meta/salt.yml
+++ b/keystone/meta/salt.yml
@@ -6,13 +6,6 @@
     priority: 510
   control:
     priority: 520
-grain:
-  keystone:
-    {%- if 'keystone_policy' in salt.keys() %}
-    keystone_policy:
-      {%- set policy_grains = salt['keystone_policy.rule_list'](path="/etc/keystone/policy.json") %}
-      {{ policy_grains|yaml(False)|indent(6) }}
-    {%- endif %}
 
 minion:
   {%- if pillar.get('keystone', {}).get('server') or pillar.get('keystone', {}).get('client') %}