pkg/resources/aws:simplify code and remove code

[Aresforchina]

ref:#7800

[k8s-ci-robot]

Hi @Aresforchina. Thanks for your PR.

I'm waiting for a kubernetes 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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[Aresforchina]

/assign @rdrgmnzs

[rifelpet]

/ok-to-test

[tanjunchen]

/test pull-kops-e2e-kubernetes-aws

[rifelpet]

It looks like this function was never used even when it was added so it should be safe to delete.

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Aresforchina, rifelpet

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[k8s-ci-robot]

@Aresforchina: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kops-e2e-kubernetes-aws	8f86a1b	link	/test pull-kops-e2e-kubernetes-aws

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.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.