Replace yum with dnf

[elfosardo]

The yum command has been deprecated some time ago, we should just use dnf to avoid future breakage.

[openshift-ci]

Hi @elfosardo. 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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[elfosardo]

/cc @tdomnesc @danmanor

[openshift-ci]

@elfosardo: GitHub didn't allow me to request PR reviews from the following users: danmanor.

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/cc @tdomnesc @danmanor

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[andfasano]

/ok-to-test

[andfasano]

/test ?

[openshift-ci]

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/test ?

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[andfasano]

/test e2e-tests

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elfosardo

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[elfosardo]

/test e2e-tests