chore: remove dependency from deprecated io/ioutil package

[kishen-v]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR removes the dependency from the io/ioutil package which has been deprecated. Required changes have been made to support the removal of the io/ioutil packages by adopting os or io.

Which issue(s) this PR fixes:

Special notes for your reviewer:

None

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kishen-v]

/cc @mborsz

[kishen-v]

/cc @wojtek-t

[k8s-ci-robot]

@kishen-v: 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-perf-tests-ec2-master-scale-performance-100	ef1f2f5	link	true	/test pull-perf-tests-ec2-master-scale-performance-100

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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