Find settings from keyring.

def parse_keyring(self, namespace=None):
        """Find settings from keyring."""
        results = {}
        if not keyring:
            return results
        if not namespace:
            namespace = self.prog
        for option in self._options:
            secret = keyring.get_password(namespace, option.name)
            if secret:
                results[option.dest] = option.type(secret)
        return results