docs: def send_results(self, client, addr, results):
          """ send back results to client in the json format of:
          {'overallRC': x, 'modID': x, 'rc': x, 'rs': x, 'errmsg': 'msg',
           'output': 'out'}
          """
          json_results = json.dumps(results)
          json_results = json_results.encode()
  
          sent = 0
          total_len = len(json_results)
          got_error = False
          while (sent < total_len):
              this_sent = client.send(json_results[sent:])
              if this_sent == 0:
                  got_error = True
                  break
              sent += this_sent
          if got_error or sent != total_len:
              self.log_error("(%s:%s) Failed to send back results to client, "
                             "results: %s" % (addr[0], addr[1], json_results))
          else:
              self.log_debug("(%s:%s) Results sent back to client successfully."
                             % (addr[0], addr[1]))