[1.5.x] Fixed #20636 -- Stopped stuffing values in the settings.

In Django < 1.6, override_settings restores the settings module that was
active when the override_settings call was executed, not when it was
run. This can make a difference when override_settings is applied to a
class, since it's executed when the module is imported, not when the
test case is run.

In addition, if the settings module for tests is stored alongside the
tests themselves, importing the settings module can trigger an import
of the tests. Since the settings module isn't fully imported yet,
class-level override_settings statements may store a reference to an
incorrect settings module. Eventually this will result in a crash during
test teardown because the settings module restored by override_settings
won't the one that was active during test setup.

While Django should prevent this situation in the future by failing
loudly in such dubious import sequences, that change won't be backported
to 1.5 and 1.4. However, these versions received the "allowed hosts"
patch and they're prone to "AttributeError: 'Settings' object has no
attribute '_original_allowed_hosts'". To mitigate this regression, this
commits stuffs _original_allowed_hosts on a random module instead of the
settings module.

This problem shouldn't occur in Django 1.6, see #20290, but this patch
will be forward-ported for extra safety.

Also tweaked backup variable names for consistency.

django/test/utils.py

@@ -4,6 +4,7 @@ from xml.dom.minidom import parseString, Node
 
 from django.conf import settings, UserSettingsHolder
 from django.core import mail
+from django.http import request
 from django.template import Template, loader, TemplateDoesNotExist
 from django.template.loaders import cached
 from django.test.signals import template_rendered, setting_changed
@@ -72,13 +73,16 @@ def setup_test_environment():
         - Set the email backend to the locmem email backend.
         - Setting the active locale to match the LANGUAGE_CODE setting.
     """
-    Template.original_render = Template._render
+    Template._original_render = Template._render
     Template._render = instrumented_test_render
 
-    mail.original_email_backend = settings.EMAIL_BACKEND
+    # Storing previous values in the settings module itself is problematic.
+    # Store them in arbitrary (but related) modules instead. See #20636.
+
+    mail._original_email_backend = settings.EMAIL_BACKEND
     settings.EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
 
-    settings._original_allowed_hosts = settings.ALLOWED_HOSTS
+    request._original_allowed_hosts = settings.ALLOWED_HOSTS
     settings.ALLOWED_HOSTS = ['*']
 
     mail.outbox = []
@@ -93,14 +97,14 @@ def teardown_test_environment():
         - Restoring the email sending functions
 
     """
-    Template._render = Template.original_render
-    del Template.original_render
+    Template._render = Template._original_render
+    del Template._original_render
 
-    settings.EMAIL_BACKEND = mail.original_email_backend
-    del mail.original_email_backend
+    settings.EMAIL_BACKEND = mail._original_email_backend
+    del mail._original_email_backend
 
-    settings.ALLOWED_HOSTS = settings._original_allowed_hosts
-    del settings._original_allowed_hosts
+    settings.ALLOWED_HOSTS = request._original_allowed_hosts
+    del request._original_allowed_hosts
 
     del mail.outbox