add keystone region support

Change-Id: Idc48db4db383ac793d2cafadbfcd100322df12e5
diff --git a/metadata/service/server/single.yml b/metadata/service/server/single.yml
index 9d07057..082e429 100644
--- a/metadata/service/server/single.yml
+++ b/metadata/service/server/single.yml
@@ -10,6 +10,7 @@
         password: ${_param:heat_domain_admin_password}
         domain: heat
       enabled: true
+      region: RegionOne
       version: ${_param:heat_version}
       bind:
         api_cfn: