[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-genx/xos-genx-tests/test_policy.py b/lib/xos-genx/xos-genx-tests/test_policy.py
index e8b5a76..9cac78a 100644
--- a/lib/xos-genx/xos-genx-tests/test_policy.py
+++ b/lib/xos-genx/xos-genx-tests/test_policy.py
@@ -13,10 +13,10 @@
 # limitations under the License.
 
 
+from __future__ import absolute_import
 import unittest
 from xosgenx.generator import XOSProcessor, XOSProcessorArgs
 from helpers import FakeObject, XProtoTestHelpers
-import pdb
 
 """
 The tests below convert the policy logic expression