Use SSD disk for journal device

use rotational info read by ohai plugin

--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

spread the journals roughly equally among available SSD devices

make it configurable if SSD should be used for journal

added new osd settings to schema

Added option to explicitely list journal devices

for "first available" mode, just take the first disk and don't add extra journal device

set device["status"] = "journal" for user listed journal devices as well