Returns the default collector settings

def get_default_config(self):
        """
        Returns the default collector settings
        """
        config = super(UnboundCollector, self).get_default_config()
        config.update({
            'path':         'unbound',
            'bin':          self.find_binary('/usr/sbin/unbound-control'),
            'histogram':    True,
        })
        return config