[SEBA-450] (part 2)

Add tox testing support on additional XOS library modules:

- xos-api
- xos-kafka (has no tests)
- xos-migrate (has no tests)
- xos-synchronizer

Change-Id: I98195bc9747971d3515882d517affe058dd86ac5
diff --git a/lib/xos-synchronizer/xossynchronizer/model_policies/policy.py b/lib/xos-synchronizer/xossynchronizer/model_policies/policy.py
index 5877279..b33a634 100644
--- a/lib/xos-synchronizer/xossynchronizer/model_policies/policy.py
+++ b/lib/xos-synchronizer/xossynchronizer/model_policies/policy.py
@@ -18,8 +18,10 @@
     Base Classes for Model Policies
 """
 
-from xosconfig import Config
+from __future__ import absolute_import
+
 from multistructlog import create_logger
+from xosconfig import Config
 
 log = create_logger(Config().get("logging"))