Store the controllers list in an instance variable
since class variables tend to stick around and mess up later tests
diff --git a/tests/cxn.py b/tests/cxn.py
index 4b3ee59..34bacad 100644
--- a/tests/cxn.py
+++ b/tests/cxn.py
@@ -25,9 +25,6 @@
     Base handshake case to set up controller, but do not send hello.
     """
 
-    controllers = []
-    default_timeout = 2
-
     def controllerSetup(self, host, port):
         con = controller.Controller(host=host,port=port)
 
@@ -42,6 +39,7 @@
     def setUp(self):
         logging.info("** START TEST CASE " + str(self))
 
+        self.controllers = []
         self.default_timeout = test_param_get('default_timeout',
                                               default=2)