subctl cloud prepare fails with OCP 4.16

[vthapar]

What happened:
subctl cloud prepare aws fails with 0.18.0-rc build on OCP 4.16 clusters.

What you expected to happen:
Cloud prepare should run successfully.

How to reproduce it (as minimally and precisely as possible):
Use subctl version 0.18.0-rc0 to run subctl cloud prepare

Anything else we need to know?:
Error log:

subctl cloud prepare aws --infra-id $infra_id --region $region --profile aws-acm-subm
 ✓ Preparing AWS cloud for Submariner deployment 
 ✓ Initializing AWS connectivity
 ✓ Retrieving VPC ID 
 ✓ Retrieved VPC ID vpc-04931defb4f5fdb83
 ✗ Validating pre-requisites 
 ✗ Unable to validate prerequisites: [security group {infraID}-worker-sg not found, insufficient number of public subnets (0) to deploy 1 Submariner gateway(s)]
 ✗ Failed to prepare AWS cloud: unable to validate prerequisites: [security group {infraID}-worker-sg not found, insufficient number of public subnets (0) to deploy 1 Submariner gateway(s)]

Environment:
Fails with subctl versions v0.18.0-rc0, v0.17.1

subctl cloud prepare aws --infra-id $infra_id --region $region --profile aws-acm-subm ✓ Preparing AWS cloud for Submariner deployment
✓ Initializing AWS connectivity
✓ Retrieving VPC ID
✓ Retrieved VPC ID vpc-0079e48203562241c
✗ Validating pre-requisites
✗ Unable to validate prerequisites: [security group {infraID}-worker-sg not found, insufficient number of public subnets (0) to deploy 1 Submariner gateway(s)]
✗ Failed to prepare AWS cloud: unable to validate prerequisites: [security group {infraID}-worker-sg not found, insufficient number of public subnets (0) to deploy 1 Submariner gateway(s)]

subctl version: v0.18.0-rc0

• Diagnose information (use subctl diagnose all):
• Gather information (use subctl gather)
• Cloud provider or hardware configuration:
• Install tools:
• Others: OCP Version 4.16.0-rc3

[yboaron]

Addressed by
submariner-io/cloud-prepare#949

And also backported to 0.18 and 0.17
submariner-io/cloud-prepare#963
submariner-io/cloud-prepare#964