[1.7.x] Revert "Fixed #15179 -- middlewares not applied for test client login()"

This reverts commit 4fdd51b732.

See the ticket for concerns with this implementation; it will be revisited.

Backport of aabceadd7d from master

docs/releases/1.7.txt

@@ -802,11 +802,6 @@ Tests
   :class:`~django.test.Client`. If ``True``, the request will be made
   through HTTPS.
 
-* Requests made with :meth:`Client.login() <django.test.Client.login>` and
-  :meth:`Client.logout() <django.test.Client.logout>` respect defaults defined
-  in :class:`~django.test.Client` instantiation and are processed through
-  middleware.
-
 * :meth:`~django.test.TransactionTestCase.assertNumQueries` now prints
   out the list of executed queries if the assertion fails.
 

docs/topics/testing/tools.txt

@@ -360,13 +360,6 @@ Use the ``django.test.Client`` class to make requests.
         :meth:`~django.contrib.auth.models.UserManager.create_user` helper
         method to create a new user with a correctly hashed password.
 
-        .. versionadded:: 1.7
-
-            Requests made with :meth:`~django.test.Client.login` go through the
-            request middleware. If you need to control the environment, you can
-            do so at :class:`~django.test.Client` instantiation or with the
-            `Client.defaults` attribute.
-
     .. method:: Client.logout()
 
         If your site uses Django's :doc:`authentication system</topics/auth/index>`,
@@ -377,13 +370,6 @@ Use the ``django.test.Client`` class to make requests.
         and session data cleared to defaults. Subsequent requests will appear
         to come from an :class:`~django.contrib.auth.models.AnonymousUser`.
 
-        .. versionadded:: 1.7
-
-            Requests made with :meth:`~django.test.Client.logout` go through the
-            request middleware. If you need to control the environment, you can
-            do so at :class:`~django.test.Client` instantiation or with the
-            `Client.defaults` attribute.
-
 Testing responses
 ~~~~~~~~~~~~~~~~~