Add pep8 like codes about ansible-testing

[sivel]

Thinking something like:

E1 - Locations

1. Interpreter line is not #!/usr/bin/python
2. main() not at the bottom of the file
3. Missing GPLv3 license header in module
4. Missing __init__.py

E2 - Imports

1. Module does not import ansible.module_utils.basic
2. Modules should not import requests, instead use ansible.module_utils.urls
3. Use of sys.exit() instead of exit_json or fail_json
4. Powershell module missing WANT_JSON
5. Powershell module missing POWERSHELL_COMMON

E3 - Documentation

1. DOCUMENTATION Missing
2. DOCUMENTATION is invalid YAML
3. DOCUMENTATION incorrect schema
4. EXAMPLES Missing
5. RETURN Missing for new modules
6. RETURN is invalid YAML
7. New modules have the correct version_added
8. New arguments have the correct version_added

E4 - Syntax

1. Invalid Python Syntax
2. Tabbed indentation

[gundalow]

This is now tracked as ansible/ansible#18187

Can you please close this issue?