OPNET-708: Add asset files for new CI job to test br-ex.

[emy]

As per OPNET-708 we found out that we do not have a reliable way to test br-ex in NMState. This PR is a preparation for the work in the release repository.

[openshift-ci]

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[openshift-ci]

Hi @emy. Thanks for your PR.

I'm waiting for a openshift-metal3 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[emy]

CC: @cybertron