Automatic merge from submit-queue

cinder: Add support for the KVM virtio-scsi driver

**What this PR does / why we need it**:

The VirtIO SCSI driver for KVM changes the way disks appear in /dev/disk/by-id.
This adds support for the new format.
Without this, volume attaching on an openstack cluster using this kvm driver doesn't work

**Special notes for your reviewer**:
Does this need e2e tests? I couldn't find anywhere to add another openstack configuration used in the e2e tests.

Wiki page about this: https://wiki.openstack.org/wiki/Virtio-scsi-for-bdm

**Release note**:

```release-note
cinder: Add support for the KVM virtio-scsi driver
```