Replace yaml.load by yaml.safe_load

Change-Id: I0e29756728212c6595276f16ac60afbfdb390214
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/src/osm_ngsa/osm_mon/core/config.py b/src/osm_ngsa/osm_mon/core/config.py
index eb0e493..22b712f 100644
--- a/src/osm_ngsa/osm_mon/core/config.py
+++ b/src/osm_ngsa/osm_mon/core/config.py
@@ -36,7 +36,7 @@
             path = "config.yaml"
             config_file = pkg_resources.resource_filename(__name__, path)
         with open(config_file) as f:
-            self.conf = yaml.load(f)
+            self.conf = yaml.safe_load(f)
 
     def get(self, section, field=None):
         if not field: