Address Django Deprecations for 4.1

django.utils.translation.ugettext_lazy() is deprecated in favor of the
functions that they’re aliases for: django.utils.translationgettext_lazy()

With that MemcachedCache backend was also deprecated in favor of
PyMemcacheCache. MemcachedCache was removed in django 4.1

https: //docs.djangoproject.com/en/4.0/releases/3.0/#id3
Change-Id: I9b77b33fbc4a9560c72504f935bf7f9082fefdd7

defaults/main.yml

@@ -146,7 +146,7 @@ horizon_service_name: horizon
 horizon_session_engine: 'django.contrib.sessions.backends.cache'
 horizon_session_caches:
   default:
-    BACKEND: 'django.core.cache.backends.memcached.MemcachedCache'
+    BACKEND: 'django.core.cache.backends.memcached.PyMemcacheCache'
     LOCATION: "{{ horizon_memcached_servers.split(',') }}"
 horizon_session_timeout: 1800
 

templates/horizon_local_settings.py.j2

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 import os
 
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 from horizon.utils import secret_key