Save test_auth_token_middleware from unlimited recursion

For Python 2.6, BaseAuthTokenMiddlewareTest will be
equal to AdjustedBaseAuthTokenMiddlewareTest in
BaseAuthTokenMiddlewareTest.setUp thus leading to
infinite recursion.

Also, parent's setUp was incorrectly called by
BaseAuthTokenMiddlewareTest.setUp twice: at the beginning
and at the end of the function.

Change-Id: I63fce65866ef9d8aebe9eb60f7ceb17463de0989
Fixes: bug #1130200

tests/test_auth_token_middleware.py

@@ -363,7 +363,7 @@ class FakeApp(object):
 class BaseAuthTokenMiddlewareTest(testtools.TestCase):
 
     def setUp(self, expected_env=None):
-        super(BaseAuthTokenMiddlewareTest, self).setUp()
+        testtools.TestCase.setUp(self)
         expected_env = expected_env or {}
 
         conf = {
@@ -390,10 +390,8 @@ class BaseAuthTokenMiddlewareTest(testtools.TestCase):
         valid_signed_list = 'VALID_SIGNED_REVOCATION_LIST'
         globals()[signed_list] = globals()[valid_signed_list]
 
-        super(BaseAuthTokenMiddlewareTest, self).setUp()
-
     def tearDown(self):
-        super(BaseAuthTokenMiddlewareTest, self).tearDown()
+        testtools.TestCase.tearDown(self)
         try:
             os.remove(self.middleware.revoked_file_name)
         except OSError: