Automatic merge from submit-queue (batch tested with PRs 43681, 40423, 43562, 43008, 43381)

Openstack cinder v1/v2/auto API support

**What this PR does / why we need it**:
It adds support for v2 cinder API + autodetection of available cinder API level (as in LBs).
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #39572

**Special notes for your reviewer**:
Based on work by @anguslees. The first two commits are just rebased from https://github.com/kubernetes/kubernetes/pull/36344 which already had a lgtm by @jbeda 

**Release note**:

```
Add support for v2 cinder API for openstack cloud provider. By default it autodetects the available version.
```