fix for backend name in hp lefthand
diff --git a/cinder/files/backend/_hp_lefthand.conf b/cinder/files/backend/_hp_lefthand.conf
index d5c3a56..12d52b6 100644
--- a/cinder/files/backend/_hp_lefthand.conf
+++ b/cinder/files/backend/_hp_lefthand.conf
@@ -1,4 +1,5 @@
 [{{ backend_name }}]
+volume_backend_name={{ backend_name }}
 hplefthand_api_url={{ backend.api_url }}
 
 hplefthand_username={{ backend.username }}