Resets an attribute of an instance to its default value.

        :type instance_id: string
        :param instance_id: ID of the instance

        :type attribute: string
        :param attribute: The attribute to reset. Valid values are:
                          kernel|ramdisk

        :rtype: bool
        :return: Whether the operation succeeded or not

def reset_instance_attribute(self, instance_id, attribute):
        """
        Resets an attribute of an instance to its default value.

        :type instance_id: string
        :param instance_id: ID of the instance

        :type attribute: string
        :param attribute: The attribute to reset. Valid values are:
                          kernel|ramdisk

        :rtype: bool
        :return: Whether the operation succeeded or not
        """
        params = {'InstanceId' : instance_id,
                  'Attribute' : attribute}
        return self.get_status('ResetInstanceAttribute', params, verb='POST')