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>

test/test_vhost.py

@@ -11,6 +11,13 @@ class TesVhostInterface(VppTestCase):
     """Vhost User Test Case
 
     """
+    @classmethod
+    def setUpClass(cls):
+        super(TesVhostInterface, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TesVhostInterface, cls).tearDownClass()
 
     def tearDown(self):
         super(TesVhostInterface, self).tearDown()