Remove unnecessary setUp()

The setUp() just calls the same method, so it is nice to remove it
for the code cleanup.

Change-Id: I278e9311970a24d398ec12f97e4637794377d266
diff --git a/tempest/tests/lib/services/identity/v2/test_token_client.py b/tempest/tests/lib/services/identity/v2/test_token_client.py
index 7925152..dfce9b3 100644
--- a/tempest/tests/lib/services/identity/v2/test_token_client.py
+++ b/tempest/tests/lib/services/identity/v2/test_token_client.py
@@ -25,9 +25,6 @@
 
 class TestTokenClientV2(base.TestCase):
 
-    def setUp(self):
-        super(TestTokenClientV2, self).setUp()
-
     def test_init_without_authurl(self):
         self.assertRaises(exceptions.IdentityError,
                           token_client.TokenClient, None)