use ceph-disk executable with -v flag

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
remove ceph-common on EL distros

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
Merge pull request #217 from alfredodeza/8829

remove ceph-common on EL distros
Merge pull request #216 from alfredodeza/7391

use ceph-disk executable with -v flag