Code review comment for lp:~danilo/maas/virsh-storage-units

This looks fine, but I'm not sure why we aren't using "virsh pool-dumpxml", which would report the units consistently in the first place. For example, I see the following:

...
  <capacity unit='bytes'>61966548992</capacity>
  <allocation unit='bytes'>35070156800</allocation>
  <available unit='bytes'>26896392192</available>
...

I'm going to approve anyway, since it seems like that work would be well beyond the scope of this branch.