[occm] - add annotation for custom octavia listener tags

[dd-georgiev]

Added support for new annotation which provides the ability to add tags when the load balancer is created. Those tags affect the load balancer and the listener. The rest of the resources are not tagged

What this PR does / why we need it: https://github.com/kubernetes/cloud-provider-openstack/issues/2327

Special notes for reviewers:

1. As far as I understood(based on Slack conversation) this functionality will be expanded. That is more features will be added.
2. Testing notes - There is e2e test, but basically adding the annotation specified in the docs, must result in having one or multiple tags on the load balancer and listener resource in openstack.
3. No extra validation is done, as the openstack document doesn't mention any excluded chars(as far as I managed to understand). There is edge-case mentioned in the openstack docs, but I don't think they apply for the LB resources. Namely:

   Filtering resources with a tag whose name contains a comma is not supported. Thus, do not put such a tag name to resources. Source: https://docs.openstack.org/mitaka/networking-guide/ops-resource-tags.html#limitations

But I don't think this will impact us, since "," is used to split the tags. Hence tag containing "," cannot exist. I didn't document this behavior as it fells like common sense. Also the docs are coming from the Mitaka project.

4. I'm not sure if this change is big enough for release notes, but I can add them if necessary

Release note:

NONE

[linux-foundation-easycla[bot]]

• :white_check_mark:login: dd-georgiev / (7a0416133badb6ce52abf9b68ae38ed92a5e0a0c)

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Hi @dd-georgiev. Thanks for your PR.

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[dulek]

/ok-to-test

[dulek]

Okay, so this needs a release note announcing the feature, that's for sure.

[dd-georgiev]

I've converted this into draft. Reason being I'm working on the extended requirement to support the ability to change the tags when the annotation is changed. This functionality will require changes to this code as well.

[k8s-ci-robot]

PR needs rebase.

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