Starting from scratch, so create a default rc file

def _write_default_sections(self):
        """ Starting from scratch, so create a default rc file """
        self.config.add_section('metadata')
        self.config.set('metadata', 'shared', 'common')
        self.config.add_section('common')
        self.config.add_section('development')
        self.config.add_section('production')