text: Title: st2ctl in Docker environment
  Body: `st2ctl` assumes it's running in a VM environment and wasn't designed to be executed inside the Docker. We'll need to improve that.
  
  Because listing processes or starting services is not viable in a Docker environment, where each service runs in its own Docker container, `st2ctl` needs a simple modification so it doesn't try to query list of processes but instead suggest to use Docker cmd.
  
  Example commands which don't work in Docker environment:
  * `st2ctl status`
  * `st2ctl stop`
  * `st2ctl start`
  * `st2ctl restart`
  * `st2ctl restart-component`
  * `st2ctl reopen-log-files`
  * `st2ctl reload` lists running processes as well
  
  