Call ironic-dbsync with proper --config-file option

Without --config-file option ironic-dbsync creates SQLite database
in the current directory, instead of migrating MySQL database.

Change-Id: Ib733dbf9198a037114f6221e974acb29d109ff22
diff --git a/lib/ironic b/lib/ironic
index 389040c..c9a2495 100644
--- a/lib/ironic
+++ b/lib/ironic
@@ -253,7 +253,7 @@
     recreate_database ironic utf8
 
     # Migrate ironic database
-    $IRONIC_BIN_DIR/ironic-dbsync
+    $IRONIC_BIN_DIR/ironic-dbsync --config-file=$IRONIC_CONF_FILE
 
     create_ironic_cache_dir
 }