ROSA: Remove or Add Additional Security Group(s) on Existing Machine Pools (Day-2)

Feature Overview (aka. Goal Summary)  

This feature strengthens both security and AWS integration themes of ROSA service. Developers deploying workloads in ROSA service often need to connect their workloads running inside OCP to other AWS Services or applications running in other VPCs. This feature will allow cluster administrators to assign optional additional Security Groups to control plane nodes, infra nodes, and all the worker nodes of machine pools (at machine pool granularity). Following will be parts of this feature that will be delivered separately (not necessarily in the phased/ordered way)

1. XCMSTRAT-46 : Support for creating additional Security Group IDs on day-one machine pool + Control Plane nodes + Infra nodes during ROSA Classic /OSD cluster creation
2. XCMSTRAT-41 : Support for creating additional Security Group IDs on day-two machine pools after ROSA Classic/OSD cluster creation
3. XCMSTRAT-319 (this): Support for changing machine pools to add/remove additional Security Group IDs on ROSA Classic/OSD cluster creation
4. XCMSTRAT-320:: upport for Additional Security Group IDs on ROSA HCP clusters

Goals (aka. expected user outcomes)

Requirements (aka. Acceptance Criteria):

See the above Goal entry.
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Consistent UX Support for clients - ROSA CLI, OCM UI and Terraform.

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.

References:

 __  [1] Scenarios for connecting to RDS Database - https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_CommonTasks.Connect.html#CHAP_CommonTasks.Connect.ScenariosForAccess 

 [2]Controlling access to RDS instance using Security Groups - https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.RDSSecurityGroups.html