reviously configured AWS public key.

        Supported methods:
            GET: /v1/auth/{mount_point}/config/certificate/:cert_name Produces: 200 application/json

        :param cert_name: Name of the certificate
        :type cert_name: str | unicode
        :param mount_point: The path the AWS auth method was mounted on.
        :return: The data key from the JSON response of the request.
        :rtype: dict
        rE