Tests Cleanup: Fix missing calls to setUpClass/tearDownClass.

Continuation/Part 2 of https://gerrit.fd.io/r/#/c/17092/

Change-Id: Id0122d84eaf2c05d29e5be63a594d5e528ee7c9a
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
diff --git a/test/test_abf.py b/test/test_abf.py
index e2f9745..1de36c9 100644
--- a/test/test_abf.py
+++ b/test/test_abf.py
@@ -135,6 +135,14 @@
 class TestAbf(VppTestCase):
     """ ABF Test Case """
 
+    @classmethod
+    def setUpClass(cls):
+        super(TestAbf, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TestAbf, cls).tearDownClass()
+
     def setUp(self):
         super(TestAbf, self).setUp()