HPCC-11156 Allow hpcc-run.sh run concurrently

1) Generate script hpcc-run_ which take only 1 input parameter: ip
2) If python 2.6+ installed it will run above script through cluster_script.py.
   It allows mulitple instances run simultanously. The default is 5.
   If no python 2.6+ found it will run the script sequentially
3) It follows original script logics:
   start: first start hpcc on the host which run dali, then start hpcc on rest hosts
   stop: first stop hpcc on all the hosts which do not have dali, then the host has dali.
4) Execution results will output to console. If "-s" provided these results will be saved
   under  /var/log/HPCCSystems/cluster/<command>/yyyymmdd_HHMMSS/
5) Log file is at /var/log/HPCCSystesm/cluster/XX_hpcc-run__yyyymmdd_HHMMSS.log
   For concurrent exection XX is "cc" If run sequentially it is "se".
Merge pull request #6014 from xwang2713/HPCC-11156-hpcc-run-2

HPCC-11156 Allow hpcc-run.sh run concurrently

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>