Bug 1822667: UPSTREAM: 88424: Respect ignore-volume-az option in admission plugin

Cherry-pick of kubernetes#88424

Origin-commit: 099d68296da64ecaeaed6e7e818f9d6436ce2cb8

Author: Fedosin

staging/src/k8s.io/legacy-cloud-providers/openstack/openstack_volumes.go

@@ -726,6 +726,11 @@ func (os *OpenStack) GetLabelsForVolume(ctx context.Context, pv *v1.PersistentVo
 		return nil, nil
 	}
 
+	// if volume az is to be ignored we should return nil from here
+	if os.bsOpts.IgnoreVolumeAZ {
+		return nil, nil
+	}
+
 	// Get metadata
 	md, err := getMetadata(os.metadataOpts.SearchOrder)
 	if err != nil {