cmdlib.sh: Add four functions of controlling daemon

Add four functions of controlling daemon:
  - start_daemon
  - stop_daemon
  - status_daemon
  - restart_daemon

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
1 file changed