Comment 24 for bug 1570825

After researching, I figured out, that the bug was reported for deployment, which uses Mitaka branch.

So fix is already here.
The root cause it, that base example of the bug tell use network directly for creation Server.
It's valid case, but it does not support rollback and cancel commands, because nova by design delete ports created for server by nova.
So there is one fix for it - is to create port by using network parameter and then use this port for creation Server resource.

I will try to prepare update for doc with description this issue.