Refactor: replace with contextual logging in LoadBalancer interfaces

[zarvd]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Start using contextual logging in parts of cloudprovider’s LoadBalancer interfaces. No function or business logic should be affected.

Which issue(s) this PR fixes:

part of #1575

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @zarvd. Thanks for your PR.

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[MartinForReal]

/ok-to-test

[MartinForReal]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MartinForReal, zarvd

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