Comment 4 for bug 1068154

My preference would be to see a renamed VM only update the hostname and display_name fields and NOT the display_description field. Also, I would not expect Nova to make changes inside a VM after it has been built. What I would expect is that when a VM is rebuilt, the new hostname would be applied to that VM and not the original hostname. I did some testing in a Havana environment and found that updating the hostname field in addition to display_name seems to fix the bug just fine.