SEBA-497 delayering, Makefile, and tox for onos-synchronizer

Change-Id: I849b307330a6fd5a5de5489d8f2db804a02acead
diff --git a/xos/synchronizer/steps/helpers.py b/xos/synchronizer/steps/helpers.py
index 9d5f197..2629638 100644
--- a/xos/synchronizer/steps/helpers.py
+++ b/xos/synchronizer/steps/helpers.py
@@ -14,6 +14,7 @@
 
 from xossynchronizer.modelaccessor import Service
 
+
 class Helpers():
     @staticmethod
     def format_url(url):