Fix SSH Username on Google Cloud instances

[DerrickMartinez]

Currently on GKE, instances are created with an SSH key username of 'admin'. This fixes it by changing the username to ubuntu, if the image used is ubuntu.

Closes #16642

[linux-foundation-easycla]

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• ✅ login: DerrickMartinez / name: Derrick Martinez (1c0c999)

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[hakman]

/ok-to-test

[DerrickMartinez]

/retest-required

[k8s-ci-robot]

@DerrickMartinez: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-test	1c0c999	link	true	/test pull-kops-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

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/lifecycle rotten