Ability to choose SCC for workload so as to avoid SCC preemption

Feature Overview (aka. Goal Summary)  

Currently, SCCs are part of the OpenShift API and are subject to modifications by customers. This leads to a constant stream of issues:

• Modifications of out-of-the-box SCCs cause core workloads to malfunction
• Addition of new higher priority SCCs may overrule existing pinned out-of-the-box SCCs during SCC admission and cause core workloads to malfunction

Goals (aka. expected user outcomes)

• Create a way to prevent SCC preemption and modifications of out-of-the-box SCCs  
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Requirements (aka. Acceptance Criteria):

A list of specific needs or objectives that a feature must deliver in order to be considered complete.  Be sure to include nonfunctional requirements such as security, reliability, performance, maintainability, scalability, usability, etc.  Initial completion during Refinement status.

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.  Initial completion during Refinement status.

Interoperability Considerations

Which other projects 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.