Fix: Removes Deprecated ioutil

Created by: donuts-are-good

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What type of PR is this?

/kind cleanup /kind deprecation

What this PR does / why we need it:

io/ioutil has been deprecated in favor of the drop in replacements "io" and "os". This commit addresses those instances of ioutil with the respective function replacements.

Special notes for your reviewer:

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Does this PR introduce a user-facing change?

NONE

Deprecated: io/ioutil has been deprecated in go. In most cases this is a drop in replacement with 'io' and 'os'. This commit removes all usage of io/ioutil.

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