docs: def _gen_net_xml(name,
                   bridge,
                   forward,
                   vport,
                   tag=None):
      '''
      Generate the XML string to define a libvirt network
      '''
      context = {
          'name': name,
          'bridge': bridge,
          'forward': forward,
          'vport': vport,
          'tag': tag,
      }
      fn_ = 'libvirt_network.jinja'
      try:
          template = JINJA.get_template(fn_)
      except jinja2.exceptions.TemplateNotFound:
          log.error('Could not load template %s', fn_)
          return ''
      return template.render(**context)