el6: support rpm install

Signed-off-by: Alexandre Marangone <alexandre.marangone@inktank.com>
el6: init script for OSD

Signed-off-by: Alexandre Marangone <alexandre.marangone@inktank.com>
el6: mon init script

Signed-off-by: Alexandre Marangone <alexandre.marangone@inktank.com>