Fix other test warnings

One about timezones, the other about a deprecationwarning

website/documents/views.py

 import os
 
+from django.conf import settings
 from django.http import Http404
 from django.shortcuts import get_object_or_404, redirect, render
 from django.utils import timezone
@@ -44,7 +45,7 @@ def get_document(request, pk):
     document = get_object_or_404(Document, pk=int(pk))
 
     if document.members_only and not request.user.is_authenticated:
-        return redirect('/login/?next=%s' % request.path)
+        return redirect('{}?next={}'.format(settings.LOGIN_URL, request.path))
 
     try:
         file = document.file

website/events/tests/test_services.py

@@ -188,7 +188,7 @@ class ServicesTest(TestCase):
         self.assertEqual(reg.member, self.member)
         self.assertEqual(reg.date_cancelled, None)
 
-        reg.date_cancelled = datetime(2017, 9, 1)
+        reg.date_cancelled = timezone.make_aware(datetime(2017, 9, 1))
         reg.save()
 
         reg = services.create_registration(self.member, self.event)
@@ -267,7 +267,7 @@ class ServicesTest(TestCase):
         Registration.objects.create(
             event=self.event,
             member=Member.objects.filter(username="testuser").first(),
-            date=datetime(2017, 9, 1)
+            date=timezone.make_aware(datetime(2017, 9, 1))
         )
 
         services.cancel_registration(None, self.member, self.event)

website/thaliawebsite/urls.py

@@ -34,7 +34,7 @@ from django.conf.urls import include, url
 from django.conf.urls.static import static
 from django.contrib import admin
 from django.contrib.auth.decorators import login_required
-from django.contrib.auth.views import login
+from django.contrib.auth.views import LoginView
 from django.contrib.sitemaps.views import sitemap
 from django.views.generic import TemplateView
 from django.views.i18n import JavaScriptCatalog
@@ -113,7 +113,7 @@ urlpatterns = [
     url(r'^announcements/', include('announcements.urls')),
     url(r'^pushnotifications/', include('pushnotifications.urls')),
     # Default login helpers
-    url(r'^login/$', login, {'authentication_form': AuthenticationForm},
+    url(r'^login/$', LoginView.as_view(), {'authentication_form': AuthenticationForm},
         name='login'),
     url(r'^', include('django.contrib.auth.urls')),
     url(r'^i18n/', include('django.conf.urls.i18n')),