Generate a config file for an upstart service.

def generate(self, overwrite=False):
        """Generate a config file for an upstart service.
        """
        super(Upstart, self).generate(overwrite=overwrite)

        svc_file_template = self.template_prefix + '.conf'
        self.svc_file_path = self.generate_into_prefix + '.conf'

        self.generate_file_from_template(svc_file_template, self.svc_file_path)
        return self.files