🐛 fix: create lbaas in specified subnet

[simonostendorf]

What this PR does / why we need it:

The load balancer should be created in the specified lb network if it is defined and it exists. This does not work, see issue #2149.
This PR tries to fix this by writing the read info for the lb network to the status.

I did lots of debugging and found out that the network and subnet info is read in every reconcile loop, written to the local variables but is not saved in the openStackCluster.Status.apiServerLoadBalancer.loadBalancerNetwork field. I tried to fix this by adding the needed line(s).

I also added some more info for the lb subnet to the status to look equal to the normal cluster subnet status.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

fixes #2149

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squashed commits
• if necessary:
  • includes documentation
  • adds unit tests

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @simonostendorf. Thanks for your PR.

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[EmilienM]

/ok-to-test