Merge pull request #2793 from lpaulmp/use-env-python-header

Set widely used header to execute python scripts in different OS

contrib/inventory_builder/inventory.py

-#!/usr/bin/python3
+#!/usr/bin/env python3
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at