Fix error at vim-update with config

Change-Id: I3083d88ae5999a53362933eae20c680b932aa218
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/RO/osm_ro/nfvo.py b/RO/osm_ro/nfvo.py
index 9e48c4a..100c6ae 100644
--- a/RO/osm_ro/nfvo.py
+++ b/RO/osm_ro/nfvo.py
@@ -5325,7 +5325,7 @@
     if config:
         original_config_dict = yaml.load(original_config, Loader=yaml.Loader)
         original_config_dict.update(config)
-        update["config"] = yaml.safe_dump(original_config_dict, default_flow_style=True, width=256)
+        update_["config"] = yaml.safe_dump(original_config_dict, default_flow_style=True, width=256)
     if name:
         update_['name'] = name
     if vim_tenant: