Comment 11 for bug 1837241

@zhipeng

First of, the default value of force_raw_images in nova project is True.

In stx 1.0, we set it to False and then force to convert the format to raw into rbd with some starlingx codes(no nova upstream).

Now in stx 2.0, we use nova upstream so we do not have some starlingx codes to force convert the format to raw into rbd. So we must set the value of force_raw_images to True. If we don't do that, vms will fail to boot when using qcow2 images.

I know that now the stein branch both nova upsteam and stx do not include the patch[0]

[0] https://review.opendev.org/#/c/640271/