Updates to scripts after refactor

- Run black to reformat all the scripts
- Update makefile test targets, pylint, and fix some of the issues found
- Update pxeconfig script for refactored nbhelper
- Add start of inventory script

Change-Id: I5f426ac2da840dc72f07f8a6844e199e47d49135
diff --git a/scripts/edgeconfig.py b/scripts/edgeconfig.py
index 7034f6c..8131335 100644
--- a/scripts/edgeconfig.py
+++ b/scripts/edgeconfig.py
@@ -11,9 +11,10 @@
 from __future__ import absolute_import
 
 import argparse
-import nbhelper
 import os
 
+import nbhelper
+
 from ruamel.yaml import YAML
 
 # main function that calls other functions