Hey,

> I have a vague recollection that some (sub)command(s) had a slightly
> inconsistent output with colons somewhere which had to be removed for
> completions. Could have been just one or two such commands but
> unfortunately I don't remember exactly anymore.

@Marko, I tried all clients I could find easily and could not find any
suggestions including colons. I cannot handle an error I don't know how to
throw. Please let me know if you remember an example.

> > * Why is there a check for not prefix-needed?
> >
> > Some comments from the original author would be quite helpful if he
> > still remembers why it was done a certain way :)
>
> Hmm, this one I don't remember, I guess this might be a common
> convention or something like that, probably not specific to _openstack.

I read up on it and I think it has something to do with how people configure
their completion preferences with `zstyle`. If you are a nice completion writer
you honor the setting. I hope I did it justice.

> I haven't dealt with OpenStack recently so I can't actually test
> anything around it anymore but if you could fix the issue that would be
> great.

I gave it a try. I ignored any colon issues for now. Would be great if someone
could.

So @list what do I need to do to get this merged?