Remove hardcoded protocol from backup_swift_url

Use SWIFT_SERVICE_PROTOCOL when configuring backup_swift_url for
cinder configuration.

Change-Id: I09de62e8deca86b473cee969ba2c5919d4f9892d
Closes-Bug: #1393554
diff --git a/lib/cinder b/lib/cinder
index eb3cbe8..611e1ca 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -258,7 +258,7 @@
     fi
 
     if is_service_enabled swift; then
-        iniset $CINDER_CONF DEFAULT backup_swift_url "http://$SERVICE_HOST:8080/v1/AUTH_"
+        iniset $CINDER_CONF DEFAULT backup_swift_url "$SWIFT_SERVICE_PROTOCOL://$SERVICE_HOST:8080/v1/AUTH_"
     fi
 
     if is_service_enabled ceilometer; then