Remove docker machine add-on from distribution

[rsmontero]

Description This issue is to remove docker-machine addon from the OpenNebula distribution including:

• [ ] source code
• [ ] packages
• [ ] documentation
• [ ] QA

Use case How are you going to use this new feature? Why do you need it?

Interface Changes Describe any changes you'd like to see to current interfaces including Sunstone, CLI, or/and API

Additional Context Please feel free to add any other context or screenshots about the feature request here. Or any other alternative you have considered to address this new feature.

Progress Status

• [ ] Code committed
• [ ] Testing - QA
• [ ] Documentation (Release notes - resolved issues, compatibility, known issues)