🌱 Migrating ./pkg/utils/openstack/loadbalancer.go to structured logging

[asarunova]

What this PR does / why we need it:
It fixes the format of the log messages and log parameters. Following the guidelines here. Part of the process to fix issue #1314. Key names for log parameters follow the suggestions from this post.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: anastaruno / name: Anastasiia Runova (f312e2c)

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[k8s-ci-robot]

Hi @anastaruno. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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