PSa enforcement deliverables in 4.14

Feature Overview (aka. Goal Summary)  

Upstream K8s deprecated PodSecurityPolicy and replaced it with a new built-in admission controller that enforces the Pod Security Standards (See here for the motivations for deprecation).] There is an OpenShift-specific dedicated pod admission system called Security Context Constraints. Our aim is to keep the Security Context Constraints pod admission system while also allowing users to have access to the Kubernetes Pod Security Admission. 

With OpenShift 4.11, we are turned on the Pod Security Admission with global "privileged" enforcement. Additionally we set the "restricted" profile for warnings and audit. This configuration made it possible for users to opt-in their namespaces to Pod Security Admission with the per-namespace labels. We also introduced a new mechanism that automatically synchronizes the Pod Security Admission "warn" and "audit" labels.

With OpenShift 4.15, we intend to move the global configuration to enforce the "restricted" pod security profile globally. With this change, the label synchronization mechanism will also switch into a mode where it synchronizes the "enforce" Pod Security Admission label rather than the "audit" and "warn". 

In OpenShift 4.14, we intend to deliver functionality in code that will help accelerate moving to PSA enforcement. This feature tracks those deliverables. 

Goals (aka. expected user outcomes)

The observable functionality that the user now has as a result of receiving this feature. Complete during New status.

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.