Update kindscaler to wait for cgroupv2 init

[farazmd]

Description

Updated kindscaler to handle cgroupv2 initialization before running kubeadm join. Also updated sed command to handle macOS BSD syntax.

Related Issue

Fixes #160

Type of Change

/kind bug

Testing

Setup kind cluster using the config provided under config/testing/kind and follow instructions for autoscaling simulation tests under docs/TEST_README.md.
The command hack/test-workloads/kindscaler.sh nrr-test 2 will wait for container to initialize cgroupv2 before running kubeadm join to join the cluster.

Checklist

• [ x ] make test passes
• [ x ] make lint passes

Does this PR introduce a user-facing change?

No. dev/testing utility change.

NONE

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[k8s-ci-robot]

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[ajaysundark]

/lgtm
/approve
/hold

Thanks for raising this. This is more of a hack script (inspired by https://github.com/lobuhi/kindscaler/) as kind doesnt support adding nodes dynamically.

We currently dont use this in any of our testing frameworks, but could benefit us in the future, when we have some kind of prow job for minimal scalability runs. Note that we also have hack/testworkloads/kwokscaler.sh that helps us to easily scale to more numbers than kind for load-testing the controller.

/cc @Karthik-K-N

for final lgtm, who has been looking into the scalability improvements.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ajaysundark, farazmd

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[farazmd]

@ajaysundark sgtm! I will switch to using kwokscaler for testing purposes.