Replace yaml.load by yaml.safe_load

Change-Id: I4f6c3802e40d763fc2175dbb2bd94dbc79b813c2
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/osm_nbi/engine.py b/osm_nbi/engine.py
index e9b1549..9b17402 100644
--- a/osm_nbi/engine.py
+++ b/osm_nbi/engine.py
@@ -205,7 +205,7 @@
             #                 "resources_to_operations file missing")
             #
             #     with open(resources_to_operations_file, 'r') as f:
-            #         resources_to_operations = yaml.load(f, Loader=yaml.Loader)
+            #         resources_to_operations = yaml.safeload(f)
             #
             #     self.operations = []
             #