Prevent some YAMLLoadWarning by using safe_load() instead of load()

Signed-off-by: Mattia Rizzolo <mapreri@ubuntu.com>

uitwww/auth.py

@@ -149,7 +149,7 @@ class Permissions:
 
     def __init__(self):
         raw = pkg_resources.resource_string("uitwww", "data/permissions.yml")
-        self.config = yaml.load(raw.decode("utf-8"))
+        self.config = yaml.safe_load(raw.decode("utf-8"))
 
     def allowed_teams(self):
         """Return a list of teams allowed to log in"""

uitwww/navbar.py

@@ -56,7 +56,7 @@ class Navbar:
     def install(self, app):
         """Install this navbar on the app"""
         raw = pkg_resources.resource_string("uitwww", "data/navbar.yml")
-        config = yaml.load(raw.decode("utf-8"))
+        config = yaml.safe_load(raw.decode("utf-8"))
         self._prepare_navbar_cache(config, [])
 
         # Add the _navbars variable to the templates

uitwww/redirects.py

@@ -23,7 +23,7 @@ import hashlib
 def prepare_blueprint(app):
     """Prepare a blueprint containing all the redirects"""
     raw = pkg_resources.resource_string("uitwww", "data/redirects.yml")
-    config = yaml.load(raw.decode("utf-8"))
+    config = yaml.safe_load(raw.decode("utf-8"))
 
     bp = flask.Blueprint("redirects", __name__)