Support Octavia setting route annotations

[fernandoroyosanchez]

This patch allows Octavia to set its route annotations.

Depends-On: openstack-k8s-operators/octavia-operator#376

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci[bot]]

Hi @fernandoroyosanchez. 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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