Comment 13 for bug 1251590

I'm a bit confused on the multiple ephemeral disk code. It appears that regardless of the number of disks created, the backing file is the same. ie fname = "ephemeral_%s_%s" % (eph['size'], os_type_with_default) is not dependent on idx. So I'm wondering if only ephemeral0 will be used in the backing file and the rest used in the qcow2 layers. If that's the case we hardcoding 'ephemeral0' for fs_label won't break anything.