add user agent to openstack api requests

[zetaab]

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[zetaab]

/test pull-kops-e2e-k8s-containerd

[olemarkus]

/lgtm

This can be quite useful

[zetaab]

@olemarkus can you check again, I just modified the names little bit. The problem that we have currently is that some kops component is calling openstack apis quite heavily. We have currently 30 kops clusters in openstack and those are making 1.2M requests in 24 hours against api (so one cluster makes 40k requests/24 hours, which is imo quite much). The problem is not csi-cinder or openstack cloud controller manager those do have own user agents. I am adding these user agents to be able to debug from where these requests are coming from. I also added uagent to etcd-manager kopeio/etcd-manager#395

currently only thing that we can see is that requests are coming from gophercloud/2.0.0

[olemarkus]

/lgtm