Remove Terraform from the OpenStack installer

Feature Overview (aka. Goal Summary)

As a result of Hashicorp's license change to BSL, Red Hat OpenShift needs to remove the use of Hashicorp's Terraform from the installer – specifically for OpenStack deployments which currently use Terraform for setting up the infrastructure.

To avoid an increased support overhead once the license changes at the end of the year, we want to provision OpenStack infrastructure without the use of Terraform.

Requirements (aka. Acceptance Criteria):

• The OpenStack Installer no longer contains or uses Terraform.
• The new provider should aim to provide the same results and have parity with the existing OpenStack Terraform provider. Specifically, we should aim for feature parity against the install config and the cluster it creates to minimize impact on existing customers' UX.

Use Cases (Optional):

Include use case diagrams, main success scenarios, alternative flow scenarios. Initial completion during Refinement status.

Questions to Answer (Optional):

Include a list of refinement / architectural questions that may need to be answered before coding can begin. Initial completion during Refinement status.

Out of Scope

High-level list of items that are out of scope. Initial completion during Refinement status.

Background

Provide any additional context is needed to frame the feature. Initial completion during Refinement status.

Customer Considerations

Provide any additional customer-specific considerations that must be made when designing and delivering the Feature. Initial completion during Refinement status.

Documentation Considerations

Provide information that needs to be considered and planned so that documentation will meet customer needs. If the feature extends existing functionality, provide a link to its current documentation. Initial completion during Refinement status.

Interoperability Considerations

Which other projects, including ROSA/OSD/ARO, and versions in our portfolio does this feature impact? What interoperability test scenarios should be factored by the layered products? Initial completion during Refinement status.