Automatic merge from submit-queue (batch tested with PRs 64318, 64269, 64438, 64516, 64311). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Ensure that only IPs are used as node addresses in OpenStack LBs
**What this PR does / why we need it**:
ATM, when no InternalIP can be found for a node, the openstack cloud provider tries to create a LB with whatever is the first address it can find for the node. This could also be the hostname or a dns name.
However, LBaaS will reject anything that is not an IP address for pool members. Therefore a meaningful error should be returned instead of just returning the first address of the node, even if it is clear that this will lead to an error in LBaaS.
**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#64317
**Special notes for your reviewer**:
**Release note**:
```release-note
Provide a meaningful error message in openstack cloud provider when no valid IP address can be found for a node
```
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