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
in the case we had, the SSDs were actually RAID0'ed, so thefore the "max 4" doesn't make sense. 

I would simply spread the number of OSD journals equally over all SSDs availble.