[occm] LoadBalancer ProxyProtocol v2 feature

[nicolaslacroux]

/kind feature

As a Kubernetes + occm user I would like to enabling the ProxyProtocol v2 as valid protocol with Octavia Load balancer.

What happened:
Currently, it is not possible to create an Octavoia load balancer from the OCCM using the "ProxyProtocolv2" protocol.

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

What you expected to happen:
Add proxy-protocol v2 annotations at Loadbalancer creation (Kubernetes service type LoadBalancer):

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

Anything else we need to know?:
Related Octavia documentation:
https://docs.openstack.org/api-ref/load-balancer/v2/#protocol-combinations-listener-pool

As an Openstack Public Cloud Provider we are currently working on a custom CCM implementation, for this reason we can potentially do the PR associated with this request, but we'd like to at least validate the implementation before starting developments.

[zetaab]

@nicolaslacroux for me the spec seems valid. Another option could be add loadbalancer.openstack.org/proxy-protocol-version annotation to specify the version. However, as I see it we could do it in one annotation that can accept values that you mentioned.

cc @dulek do you have opinion?

[dulek]

I like the design proposed and I see value in not introducing new annotations.