HPCC-11257 update hpcc-init stop return 0 instead 3

Set return code to 0 instead of 3 in following scenarios:
1) the process is already stopped.
2) the process is stopped after start-stop-daemon -K call and before
   or during the first check_status call.
Merge pull request #5726 from xwang2713/HPCC_11257_stop_3

HPCC-11257  make 'hpcc-init stop' return 0 instead 3

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>