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/tests/pillar/control_single.sls b/tests/pillar/control_single.sls
index ef2136a..ac8db5a 100644
--- a/tests/pillar/control_single.sls
+++ b/tests/pillar/control_single.sls
@@ -36,3 +36,6 @@
         port: 22
         user: username
         password: pass
+    policy:
+      'volume:delete': 'rule:admin_or_owner'
+      'volume:extend':