enable ingress-node-firewall on 4.20 version as bug is fixed

[zhaozhanqi]

4.20 pr is fixed openshift/ingress-node-firewall#672 and merged

[openshift-ci]

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[openshift-ci]

Hi @zhaozhanqi. Thanks for your PR.

I'm waiting for a openshift-eng member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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