Comment 1 for bug 1881891

I also found this issue, when I made some change in /usr/local/lib/python3.6/site-packages/freezer/engine/nova/nova.py like below:
   fb.writelines(json.dumps(metadata)) --> fb.writelines(json.dumps(metadata).encode())

can work around this issue, but next will encounter another issue "must be str, not bytes "

I donot know how to fix it any more