Automatic merge from submit-queue (batch tested with PRs 46151, 47602, 47507, 46203, 47471)
rebase gophercloud to support HTTP status 300 in pagination, so listingng Cinder v1/v2 API versions won't break
**What this PR does / why we need it**:
Since Cinder block v1/v2 support lands in 1.7, we have to ensure Cinder block api list won't fail due to https://github.com/gophercloud/gophercloud/pull/384.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#47651
**Special notes for your reviewer**:
@anguslees @NickrenREN
**Release note**:
```release-note
NONE
```
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