add Keystone region configuration

Change-Id: Icda5d46c296fcb2f7599dc9957baf15dd0925c54
diff --git a/tests/pillar/control_cluster.sls b/tests/pillar/control_cluster.sls
index 430eb04..0f2ea95 100644
--- a/tests/pillar/control_cluster.sls
+++ b/tests/pillar/control_cluster.sls
@@ -13,6 +13,7 @@
       password: password
     identity:
       engine: keystone
+      region: RegionOne
       host: 127.0.0.1
       port: 35357
       tenant: service