Update 0.6 branch with new namespaced user info field

[modulitos]

What this PR does / why we need it:

Cherry-pick changes from: https://github.com/kubernetes-sigs/aws-iam-authenticator/pull/743/files

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes # N/A

[k8s-ci-robot]

Hi @modulitos. Thanks for your PR.

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[prateekgogia]

/ok-to-test

[xdu31]

It looks we have the convention to cut release in a separate PR, not sure if it can work if we do it together with other changes

[modulitos]

Thank for the heads up - I removed the change from the PR.

Once this PR is merged, I'll send a separate PR to bump the version again.

[modulitos]

PR to only bump the version: #748

[micahhausler]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: micahhausler, modulitos

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