[release-3.8] Fix example certificates used in router tests

[openshift-cherrypick-robot]

This is an automated cherry-pick of #17959

/assign mfojtik

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[mfojtik]

@deads2k need this for 3.8 ?

[deads2k]

/retest

[soltysh]

/retest

[soltysh]

/retest

[mfojtik]

/retest

@deads2k i think you need to exercise the green button on this...

[soltysh]

/retest

[deads2k]

/retest

@deads2k i think you need to exercise the green button on this...

This pull has never had a green test-cmd run and all six runs failed the same way. That is very suspicious.

[openshift-ci-robot]

@openshift-cherrypick-robot: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/cmd	63032d9	link	/test cmd
ci/openshift-jenkins/extended_conformance_install	63032d9	link	/test extended_conformance_install

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[liggitt]

integration and e2e are green. the test-cmd failure will be fixed by #17975

[liggitt]

test-cmd failure is known and unrelated. merging on green integration and e2e