[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/xos-genx-tests/helpers.py b/lib/xos-genx/xos-genx-tests/helpers.py
index ae52076..4687bb3 100644
--- a/lib/xos-genx/xos-genx-tests/helpers.py
+++ b/lib/xos-genx/xos-genx-tests/helpers.py
@@ -1,4 +1,3 @@
-
 # Copyright 2017-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -19,18 +18,19 @@
 # Constants
 OUTPUT_DIR = os.path.abspath(os.path.dirname(os.path.realpath(__file__)) + "/out/")
 
-TMP_TARGET_PATH = os.path.join(OUTPUT_DIR, 'tmp.xtarget')
+TMP_TARGET_PATH = os.path.join(OUTPUT_DIR, "tmp.xtarget")
 
 # Passed around in various security / validation checks
+
+
 class FakeObject:
     pass
 
-class XProtoTestHelpers:
 
+class XProtoTestHelpers:
     @staticmethod
     def write_tmp_target(target):
-        tmp_file = open(TMP_TARGET_PATH, 'w')
+        tmp_file = open(TMP_TARGET_PATH, "w")
         tmp_file.write(target)
         tmp_file.close()
         return TMP_TARGET_PATH
-