Added ubuntu 20.04 vmx image

[sparshev]

Description

This change adds a simple ubuntu 20.04 image for vmx driver, I hope it will serve well. It contains a couple of optimizations to not connect to mothership and be a good useful environment overall.

Also added a way to reach the remote locations by using http proxy started on the host system when needed. That helped to install build-essential package from the remote repository.

Related Issue

2

How Has This Been Tested?

Tested manually

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] 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.