Use SSD disk for journal device

use rotational info read by ohai plugin

Add SSD function in library

default value for new partition start

--journal-dev does not use device as argument; real journal device comes to the end of command

while available, select new SSD device for each next OSD device

do not create the SSD partition, let ceph-disk create it
bigger default value of journal size

for disk_mode == "first", find first non-ssd disk, and (if present) also first ssd disk

spread the journals roughly equally among available SSD devices

Set proper journal partition type

make it configurable if SSD should be used for journal

added new osd settings to schema