Fixed settings.py incompatible with Django 2.0 (#1323)

MIDDLEWARE_CLASSES are removed in Django 2.0

Author: chenyumic

appengine/flexible/django_cloudsql/mysite/settings.py

@@ -44,15 +44,14 @@
     'polls'
 )
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = (
+    'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
-    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-    'django.middleware.security.SecurityMiddleware',
 )
 
 ROOT_URLCONF = 'mysite.urls'

appengine/flexible/hello_world_django/project_name/settings.py

@@ -54,15 +54,14 @@
     'helloworld'
 )
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = (
+    'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
-    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-    'django.middleware.security.SecurityMiddleware',
 )
 
 ROOT_URLCONF = 'project_name.urls'