Policy.json should be defined by user

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

Change-Id: Ide69691fe5dc4dd684159ad3f29bfeb1638c9bf3
diff --git a/.kitchen.yml b/.kitchen.yml
index 5ef8ebf..a2b4313 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -18,6 +18,9 @@
     - name: linux
       repo: git
       source: https://github.com/salt-formulas/salt-formula-linux
+    - name: keystone
+      repo: git
+      source: https://github.com/salt-formulas/salt-formula-keystone
   state_top:
     base:
       "*":