move testutils to src/python/oftest

testutils.py needs to be in a common location for different directories of
tests to use it.
diff --git a/tests/FuncUtils.py b/tests/FuncUtils.py
index 6951293..d12c388 100644
--- a/tests/FuncUtils.py
+++ b/tests/FuncUtils.py
@@ -13,7 +13,7 @@
 import logging
 import types
 import basic
-from testutils import *
+from oftest.testutils import *
 from time import sleep
 
 #################### Functions for various types of flow_mod  ##########################################################################################