added retry logic on socket connection

                logging.info('MAKING CONNECTION')

                # open socket

                skt = None

                while skt == None:

                    skt = pakbus.open_socket(host, port, timeout)

                    if skt == None:

                        self.log.error("Failed to open socket, retry")

                #if (len(pakbus_ids) != len(metric_ids)):

                    #logging.error("'pakbus_ids' and 'metric_ids' need to have the same number of elements")