AB-5 Added a way to override the ansible role variables for specific envs

[sparshev]

Description

This change adds an additional file overrides.yml in the root of the repository that could be created and used by ansible to override the required variables in the role.

Small fixes:

• Removed tools_upload_flavor since we're doing it manually to ensure of the tools version
• Fixed a small thing with checking git executable - better than using module

Related Issue

5

Motivation and Context

It makes the Aquarium Bait usable in the real world.

How Has This Been Tested?

Locally and I promise it works)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.