[SEBA-412] Automated reformat of Python code

Passes of modernize, autopep8, black, then check with flake8

flake8 + manual fixes:
  lib/xos-config
  lib/xos-kafka
  lib/xos-util
  xos/coreapi
  xos/api
  xos/xos_client

Change-Id: Ib23cf84cb13beb3c6381fa0d79594dc9131dc815
diff --git a/lib/xos-genx/xosgenx/jinja2_extensions/__init__.py b/lib/xos-genx/xosgenx/jinja2_extensions/__init__.py
index 859594c..bf7a812 100644
--- a/lib/xos-genx/xosgenx/jinja2_extensions/__init__.py
+++ b/lib/xos-genx/xosgenx/jinja2_extensions/__init__.py
@@ -1,4 +1,3 @@
-
 # Copyright 2017-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
 from .django import *
 from .base import *
 from .fol2 import *
 from .gui import *
 from .tosca import *
 from .checklib import *
+
+__all__ = ["django", "base", "fol2", "gui", "tosca", "checklib"]