[SEBA-571] Reset subscriber status when ONU is disabled

Change-Id: Ic05484e0bbf52ab82ee712b895638cbe4e4bacf9
diff --git a/xos/synchronizer/event_steps/test_dhcp_event.py b/xos/synchronizer/event_steps/test_dhcp_event.py
index 275c1ef..2b9b963 100644
--- a/xos/synchronizer/event_steps/test_dhcp_event.py
+++ b/xos/synchronizer/event_steps/test_dhcp_event.py
@@ -103,5 +103,5 @@
 
 
 if __name__ == '__main__':
-    sys.path.append("..")  # for import of helpers.py
+    sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)), ".."))  # for import of helpers.py
     unittest.main()