Set os_region_name for cinder

Region name should be set to nova.conf and cinder.conf so that
cinder volume can work in multiregion env.

Closes-Bug: #1429738
Change-Id: Ib20911c24d8daabc07e6515f4a23a745d77593ff
diff --git a/lib/cinder b/lib/cinder
index 0d157dd..19240ee 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -242,6 +242,8 @@
     # supported.
     iniset $CINDER_CONF DEFAULT enable_v1_api true
 
+    iniset $CINDER_CONF DEFAULT os_region_name "$REGION_NAME"
+
     if is_service_enabled c-vol && [[ -n "$CINDER_ENABLED_BACKENDS" ]]; then
         local enabled_backends=""
         local default_name=""