[urls] Fix typo and remove unused imports

cas_server/tests/urls.py

@@ -14,15 +14,13 @@ Including another URLconf
     2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
 """
 
-import django
-
 try:
     from django.urls import re_path
 except ImportError:
     # re_path is not available in Django 2
-    from django.conf.urls import url as re_pa
+    from django.conf.urls import url as re_path
 
-from django.conf.urls import url, include
+from django.conf.urls import include
 from django.contrib import admin
 
 urlpatterns = [

cas_server/urls.py

@@ -11,16 +11,12 @@
 # (c) 2015-2016 Valentin Samir
 """urls for the app"""
 
-import django
-
-
 try:
     from django.urls import re_path
 except ImportError:
     # re_path is not available in Django 2
     from django.conf.urls import url as re_path
 
-from django.conf.urls import url
 from django.views.generic import RedirectView
 from django.views.decorators.debug import sensitive_post_parameters, sensitive_variables