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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def write_config(self):
 """ Writes the provisioner's config file to disk and returns None. :return: None """

        template = util.render_template(
            self._get_config_template(), config_options=self.config_options)
        util.write_file(self.config_file, template)