chore: remove refs to deprecated io/ioutil

[testwill]

Pull Request template

Why is this PR required? What issue does it fix?: remove refs to deprecated io/ioutil

What this PR does?:

Does this PR require any upgrade changes?:

If the changes in this PR are manually verified, list down the scenarios covered::

Any additional information for your reviewer? : Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• [ ] Fixes #
• [ ] PR Title follows the convention of <type>(<scope>): <subject>
• [ ] Has the change log section been updated?
• [ ] Commit has unit tests
• [ ] Commit has integration tests
• [ ] (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• [ ] (Optional) If documentation changes are required, which issue on https://github.com/openebs/openebs-docs is used to track them:

PLEASE REMOVE BELOW INFORMATION BEFORE SUBMITTING

The PR title message must follow convention: <type>(<scope>): <subject>.

Where: Most common types are: * feat - for new features, not a new feature for build script * fix - for bug fixes or improvements, not a fix for build script * chore - changes not related to production code * docs - changes related to documentation * style - formatting, missing semi colons, linting fix etc; no significant production code changes * test - adding missing tests, refactoring tests; no production code change * refactor - refactoring production code, eg. renaming a variable or function name, there should not be any significant production code changes * cherry-pick - if PR is merged in develop branch and raised to release branch(like v0.4.x)

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