Modules and script hard code /usr/bin/python in hashbang

A number of modules, and scripts in the test suite start with

#!/usr/bin/python

In general it is better to use

#!/usr/bin/env python

because that allows execution inside a virtualenv, or when python is installed elsewhere, e.g. /usr/loca/bin/python.

There may be cases in which we really do want to hard code the path, e.g.

• testing detection/selection of ansible_python_interpreter (correct name?)
• mechanics of Ansible module transfer, or recognition .

If so those should be explictly noted in a comment.