use the recommended yaml.safe_load function

reason: with pyyaml >= 5, the load function without Loader is deprecated.
Even if we do not use version 5 for now, we should use good practices.
https://pyyaml.org/wiki/PyYAMLDocumentation#loading-yaml
yaml/pyyaml#257

integration_tests/suite/helpers/base.py

@@ -1,4 +1,4 @@
-# Copyright 2018 The Wazo Authors  (see the AUTHORS file)
+# Copyright 2018-2019 The Wazo Authors  (see the AUTHORS file)
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 import os
@@ -109,7 +109,7 @@ def _get_service_config(self, service_name):
             'cat',
             '/var/lib/wazo-auth-keys/{}-key.yml'.format(service_name)
         ])
-        result = yaml.load(output.decode('utf-8'))
+        result = yaml.safe_load(output.decode('utf-8'))
         print('_get_service_config sevrice: {}, result: {}'.format(service_name, result))
         return result
 

wazo_auth_keys/main.py

@@ -1,4 +1,4 @@
-# Copyright 2018 The Wazo Authors  (see the AUTHORS file)
+# Copyright 2018-2019 The Wazo Authors  (see the AUTHORS file)
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 import os
@@ -68,7 +68,7 @@ def initialize_app(self, argv):
         self._auth_config = dict(conf['auth'])
 
         with open(self.options.config, 'r') as f:
-            self.services = yaml.load(f)
+            self.services = yaml.safe_load(f)
         self.file_manager = FileManager(self, self.options.base_dir)