Remove ioutil from client-go

[inosato]

Signed-off-by: inosato [email protected]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Remove ioutil from client-go.

Which issue(s) this PR fixes:

Fixes # NONE Related to https://github.com/kubernetes/kubernetes/issues/100367

Special notes for your reviewer:

NONE

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @inosato. Thanks for your PR.

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[fedebongio]

/assign @yliaog /triage accepted

[yliaog]

/ok-to-test

[yliaog]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inosato, yliaog

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• ~~staging/src/k8s.io/client-go/OWNERS~~ [yliaog]

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[k8s-triage-robot]

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/retest