Make proxy protocol in upcloud LB configurable

[davidumea]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change

/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

To make it possible for Upclouds loadbalancers to use proxy protocol.

Which issue(s) this PR fixes:

Special notes for your reviewer:

I wasn't sure whether this would count as an "api-change" or if it should be "kind/feature".

Does this PR introduce a user-facing change?:

Make proxy protocol in Upcloud LB configurable

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: davidumea / name: David (c0a712b)

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[k8s-ci-robot]

Hi @davidumea. Thanks for your PR.

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[yankay]

Thanks @davidumea

/ok-to-test
/approve

[yankay]

/approve

[davidumea]

@yankay Is there anything holding this PR back from moving forward?

[yankay]

HI @MrFreezeex @VannTen
Would you please help to review it

[MrFreezeex]

Thanks
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidumea, MrFreezeex, yankay

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