[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/VERSION b/VERSION
index 21bb5e1..bda8fbe 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.5
+2.2.6