Declare the config attribute in a simpler way

tempest/test.py was declared in the __init__ in order to avoid possible style check issues.

Change-Id: I781c24d1b82d169a40aee6a264dbc203e5833f87
diff --git a/tempest/test.py b/tempest/test.py
index 4db9827..6af95f9 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -51,10 +51,8 @@
 class BaseTestCase(testtools.TestCase,
                    testtools.testcase.WithAttributes,
                    testresources.ResourcedTestCase):
-    def __init__(self, *args, **kwargs):
-        super(BaseTestCase, self).__init__(*args, **kwargs)
-        #NOTE(afazekas): inspection workaround
-        BaseTestCase.config = config.TempestConfig()
+
+    config = config.TempestConfig()
 
     @classmethod
     def setUpClass(cls):