Enforce scope in RBAC testing

Ensure that the Barbican service is configured to use scoped
tokens when checking RBAC policy.

Depends-On: Id399d2220118efe1033426c658d1834cbff02f94

Change-Id: Id7aa02ea4862242fa34140166d634f30af721c22
diff --git a/.zuul.yaml b/.zuul.yaml
index 753b57b..be73dc7 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -63,6 +63,7 @@
           $BARBICAN_CONF:
             oslo_policy:
               enforce_new_defaults: True
+              enforce_scope: True
         test-config:
           $TEMPEST_CONFIG:
             # FIXME(redrobot): Tempest errors out when you try to create a