Pick default region from openstack_region for ironic

This patch makes sures ironic pick default region
from _param:openstack_region.

Change-Id: I35fd1db8d1af8a55d9275407aef153b4dba7f0d3
Related-Prod: PROD-25905
diff --git a/ironic/conductor/storage/cinder.yml b/ironic/conductor/storage/cinder.yml
index 17f23e5..8e5ea12 100644
--- a/ironic/conductor/storage/cinder.yml
+++ b/ironic/conductor/storage/cinder.yml
@@ -9,3 +9,4 @@
         project_name: service
         user_domain_name: Default
         username: cinder
+        region: ${_param:openstack_region}