Add Kubernetes version to AWS CI

[andreyvelich]

I added Kubernetes version to our AWS CI.
We should be able to use this env: https://github.com/kubeflow/testing/blob/master/images/aws-scripts/create-eks-cluster.sh#L29

[google-oss-prow]

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[tenzen-y]

Thank you for upgrading the EKS version! @andreyvelich
As far as I read this document, it looks like Kubernetes v1.22 is not yet available for EKS.

[andreyvelich]

Thank you @tenzen-y.
As I can see, our eksctl supports only 1.15, 1.16, 1.17, 1.18, 1.19: https://argo.kubeflow-testing.com/workflows/kubeflow-test-infra/kubeflow-katib-presubmit-e2e-v1beta1-1758-8edde1b-6448-9dc4?tab=workflow&nodeId=kubeflow-katib-presubmit-e2e-v1beta1-1758-8edde1b-6448-9dc4-2662824946&sidePanel=logs%3Akubeflow-katib-presubmit-e2e-v1beta1-1758-8edde1b-6448-9dc4-2662824946%3Amain

[andreyvelich]

I guess, we should re-built our AWS CI Worker Image if we want to use the latest eksctl version which supports K8s >= 1.19

[tenzen-y]

I guess, we should re-built our AWS CI Worker Image if we want to use the latest eksctl version which supports K8s >= 1.19

It makes sense. @andreyvelich
The latest eksctl v0.76.0 seems to support Kubernetes v1.18, v1.19, v1.20, and v1.21.

EKS supports versions 1.18, 1.19, 1.20 and 1.21 (default). With eksctl you can deploy any of the supported versions by passing --version.

https://eksctl.io/introduction/#basic-cluster-creation

[coveralls]

Coverage decreased (-0.1%) to 74.088% when pulling 8977e43 on andreyvelich:aws-ci-update-k8s-version into 1519724 on kubeflow:master.

[tenzen-y]

FYI
The eksctl version will be changed to v0.76.0.
kubeflow/testing#972

[andreyvelich]

/retest

[andreyvelich]

@tenzen-y @gaocegege @johnugeorge Let's merge this PR to use Kubernetes 1.19 version at least.
The 1.18 version is deprecated and will be disabled soon on EKS clusters.

[tenzen-y]

Thanks for this update @andreyvelich!

This is just a comment.
I think we need to upgrade our CI Clusters version when K8s v1.22.x is released on EKS.

/lgtm