[SEBA-314] Refactoring multistructlog

- Redid the way loggers are created to use vanilla structlog
  - This fixes the incorrect line numbering and similar in SEBA-314
- Fix/rewrite unit tests
- Apply pep8 formatting
- Make compatible with Python 3.x, enable multi-version testing with tox
- Removed XOS specific code

Change-Id: I615bc6f32ba2592475e3a8cf22850c563001a3d4
diff --git a/unittest.cfg b/unittest.cfg
new file mode 100644
index 0000000..544a816
--- /dev/null
+++ b/unittest.cfg
@@ -0,0 +1,8 @@
+[unittest]
+plugins=nose2.plugins.junitxml
+
+[coverage]
+always-on=True
+coverage=
+  multistructlog
+coverage-report=xml