[occm] LoadBalancer ProxyProtocol v2 feature

[Lucasgranet]

What this PR does / why we need it:
The PR brings the ability of choosing the ProxProtocol in version 2 (instead of v1).

Two new values are supported for loadbalancer.openstack.org/proxy-protocol

loadbalancer.openstack.org/proxy-protocol: "true" # Enable ProxyProtocolv1
loadbalancer.openstack.org/proxy-protocol: "false" # Default value, no proxy protocol enable 
loadbalancer.openstack.org/proxy-protocol: "v1" # NEW - Enable ProxyProtocolv1
loadbalancer.openstack.org/proxy-protocol: "v2" # NEW - Enable ProxyProtocolv2

Which issue this PR fixes(if applicable):
fixes #2585

Special notes for reviewers:
N/A

Release note:

[openstack-cloud-controller-manager] Support LoadBalancer ProxyProtocol v2 feature

[k8s-ci-robot]

Hi @Lucasgranet. Thanks for your PR.

I'm waiting for a kubernetes 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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[zetaab]

/ok-to-test

[Lucasgranet]

@zetaab I'm not sure but E2E's failures seem not related to my PR.

Can you have a look please?

[zetaab]

/test openstack-cloud-controller-manager-e2e-test
/test openstack-cloud-controller-manager-ovn-e2e-test

[zetaab]

@Lucasgranet can you rebase this pr against master? Master contain fixes for the e2e tests

[Lucasgranet]

/retest

[zetaab]

/approve

Thank you @Lucasgranet

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zetaab

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[jichenjc]

loadbalancer.openstack.org/proxy-protocol: "true" # Enable ProxyProtocolv1

from this comment I think default is still v1, correct ?

[jichenjc]

/lgtm

[zetaab]

/lgtm