Migrate away from deprecated ioutil

[sebrandon1]

ioutil has been deprecated since Go 1.16: https://go.dev/doc/go1.16#ioutil

Test code modernization:

• Replaced ioutil.TempDir with os.MkdirTemp for creating temporary directories in test setup.
• Replaced ioutil.WriteFile with os.WriteFile for writing test rule files in multiple test cases. [1] [2] [3] [4]
• Removed the unused import of ioutil from the test file.

Tracking issue: redhat-best-practices-for-k8s/telco-bot#52

[openshift-ci]

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[openshift-ci]

@sebrandon1: 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
ci/prow/security	1350806	link	false	/test security

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[SchSeba]

/hold

[SchSeba]

lets wait and check the new nftable implementation #77
if we still need to fix that please do it on the u/s repo first https://github.com/k8snetworkplumbingwg/multi-networkpolicy-nftables

[SchSeba]

closing this one. as this repo must but a d/s sync only from the upstream repo

/close

[openshift-ci]

@SchSeba: Closed this PR.

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In response to this:

closing this one. as this repo must but a d/s sync only from the upstream repo

/close

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[sebrandon1]

Sounds good! I'll take a look at the upstream.