Returns the default collector settings

def get_default_config(self):
        """
        Returns the default collector settings
        """
        config = super(PostfixCollector, self).get_default_config()
        config.update({
            'path':             'postfix',
            'host':             'localhost',
            'port':             7777,
            'include_clients':  True,
        })
        return config