[SEBA-450] (part 1)

Refactoring, python3 compat, and tox tests on:

- xosconfig
- xosgenx
- xosutil

Eliminate use of yaml.load() which is unsafe, switch to yaml.safe_load()

More diagnostics during database migration

Change-Id: I0fae5782fca401603a7c4e4ec2b9269ad24bda97
diff --git a/lib/xos-util/setup.py b/lib/xos-util/setup.py
index a3707ef..a542cb9 100644
--- a/lib/xos-util/setup.py
+++ b/lib/xos-util/setup.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright 2017-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -14,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import absolute_import
 
 from xosutil.autoversion_setup import setup_with_auto_version
 from xosutil.version import __version__