Policy.json should be defined by user

User can override and add values to policy.json by creating flat
key-value structure under cinder:controller:policy.

Change-Id: I1d58c632442cd1ffb19f2020ab9e5e63bea975a9
diff --git a/.kitchen.yml b/.kitchen.yml
index bf95612..be889a8 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -14,6 +14,10 @@
   formula: cinder
   grains:
     noservices: True
+  dependencies:
+    - name: keystone
+      repo: git
+      source: https://github.com/salt-formulas/salt-formula-keystone
   state_top:
     base:
       "*":