Set AWS loadbalancer scheme to internal when not selecting non internet-facing

[randomvariable]

What this PR does / why we need it

Which issue(s) this PR fixes

Fixes #
This programatically encodes the workaround for the "This is a non-internet facing VPC" option not working in https://docs.vmware.com/en/VMware-Tanzu-Kubernetes-Grid/1.3/vmware-tanzu-kubernetes-grid-13/GUID-mgmt-clusters-airgapped-environments.html#step-5-initialize-tanzu-kubernetes-grid-9

• Makefile: Allow OpenAPI generation to work on Fedora SELinux
• Fix setting AWS loadbalancer scheme to internal

Describe testing done for PR

Tested created clusters via UI and config file with and without internet facing.

Release note

When deploying a regional cluster in a non-internet facing VPC, the AWS ELB scheme is now correctly set to internal.

PR Checklist

• Squash the commits into one or a small number of logical commits
  
• Use good commit messages
• Ensure PR contains terms all contributors can understand and links all contributors can access

Additional information

Special notes for your reviewer

I had to include a fixup to the Makefile to generate the OpenAPI client on Fedora with SELinux enabled.

[randomvariable]

@miclettej can you take a look as I'm fiddling in the frontend without a real clue what I'm doing again.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/1109/20211109172333/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/1109/20211109181028/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/1109/20211109192317/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[miclettej]

UI change looks good. Thank you for taking care of this.

[randomvariable]

Tested locally, ready for merge.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/1109/20211109203602/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.