Policy.json should be defined by user

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

Change-Id: I4db6b17ab1ff925aa20cd3565417a4b35ed4561e
diff --git a/tests/pillar/single_swift_references.sls b/tests/pillar/single_swift_references.sls
index dcb4385..cdc8797 100644
--- a/tests/pillar/single_swift_references.sls
+++ b/tests/pillar/single_swift_references.sls
@@ -67,3 +67,6 @@
                 version: 2
               user: 2ec7966596504f59acc3a76b3b9d9291:glance-user
               key: someRandomPassword
+    policy:
+      publicize_image: "role:admin"
+      add_member: