[WIP] Add openstack provider support

[stgleb]

• [ ] Fix (a bug or other issue was fixed)
• [x] Feature (new functionality was added)
• [ ] Breaking (existing functionality was affected)
• [ ] Other (please explain below)

Add support for openstack provider

• [ Documentation was needed, and I updated it.
• [x] Documentation was not needed.
• [ ] I understand the Contribution Guidelines.