code: func (e *execStreamer) ExecAndWait() error {
  	cmd, err := e.StartExec()
  	if err != nil {
  		return err
  	}
  
  	e.stdOutAndErrWaitGroup.Wait()
  
  	err = cmd.Wait()
  	if err != nil {
  		return err
  	}
  
  	return nil
  }
docs: //ExecAndWait will execute the command using the given executor and wait until completion