Committer: Xiaoxi Chen <xiaoxi.chen@intel.com>
    modified:   src/init-ceph.in
    fixed bug in init script, the "df" and "hostname -s" should be run on remote host by do_root_cmd,
    instead of run it directly in local bash.

Signed-off-by: Xiaoxi Chen <xiaoxi.chen@intel.com>