data/type.yaml.tmpl: Use ceph_osd_devices hiera parameter instead of puppet default value

Signed-off-by: Dimitri Savineau <dimitri.savineau@enovance.com>
Merge pull request #12 from dsavineau/ceph-osd-devices

data/type.yaml.tmpl: Use ceph_osd_devices hiera parameter instead of pup...