Use SSD disk for journal device (WIP)

Try to find out if device is SSD disk, and use it for journal device


https://github.com/crowbar/barclamp-deployer/pull/211 is required
> I think we need to somehow zap the journal disk on first run

OK, I'll look into that

> also "--journal-dev" might be missing here.

Hm, I had the impression that journal device is added to the command without specific argument... but it was probably some old API