End-to-end testing framework for IAM authenticator

[richzli]

Created an end-to-end testing framework for the authenticator. README in ./hack/e2e.

[k8s-ci-robot]

Hi @richzli. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nckturner]

/assign @wongma7

[richzli]

If this looks good, I'll rebase it.

[nckturner]

/ok-to-test

[nckturner]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nckturner, richzli

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