docs: def _worker_ctl(worker, lbn, vwa, profile='default'):
      '''
      enable/disable/stop a worker
      '''
  
      cmd = {
          'cmd': 'update',
          'mime': 'prop',
          'w': lbn,
          'sw': worker,
          'vwa': vwa,
      }
      return _do_http(cmd, profile)['worker.result.type'] == 'OK'