Fix webhook tests for Django 1.11-alpha

Django 1.11 appears to enforce ALLOWED_HOSTS
(more strictly) during tests.

tests/test_mandrill_webhooks.py

@@ -96,7 +96,9 @@ class MandrillWebhookSecurityTestCase(WebhookTestCase, WebhookBasicAuthTestsMixi
         response = self.client.post(**kwargs)
         self.assertEqual(response.status_code, 200)
 
-    @override_settings(ANYMAIL={
+    @override_settings(
+        ALLOWED_HOSTS=['127.0.0.1', '.example.com'],
+        ANYMAIL={
             "MANDRILL_WEBHOOK_URL": "https://abcde:12345@example.com/anymail/mandrill/tracking/",
             "WEBHOOK_AUTHORIZATION": "abcde:12345",
         })

tests/test_utils.py

@@ -149,6 +149,7 @@ class UpdateDeepTests(SimpleTestCase):
         self.assertEqual(first, {'a': {'a1': 1, 'a2': 2}, 'c': {'c1': 1}})
 
 
+@override_settings(ALLOWED_HOSTS=[".example.com"])
 class RequestUtilsTests(SimpleTestCase):
     """Test utils.get_request_* helpers"""