Add required test variables into horizon.conf

[HanzJas]

Add required test variables/values which are used as default values for Horizon tests, into horizon.conf

[openshift-ci]

Hi @HanzJas. Thanks for your PR.

I'm waiting for a openstack-k8s-operators 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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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: HanzJas
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