Called when RabbitMQ has been connected to.

        :param pika.connection.Connection connection: The pika connection

def on_rabbitmq_conn_open(self, connection):
        """Called when RabbitMQ has been connected to.

        :param pika.connection.Connection connection: The pika connection

        """
        global pending_rabbitmq_connection, rabbitmq_connection
        LOGGER.info('RabbitMQ has connected')
        rabbitmq_connection = connection
        rabbitmq_connection.add_on_close_callback(self.on_rabbitmq_close)
        rabbitmq_connection.channel(self.on_rabbitmq_channel_open)
        pending_rabbitmq_connection = None