docs: def _auth(url):
      '''
      Install an auth handler for urllib2
      '''
      user = __salt__['config.get']('solr.user', False)
      password = __salt__['config.get']('solr.passwd', False)
      realm = __salt__['config.get']('solr.auth_realm', 'Solr')
  
      if user and password:
          basic = _HTTPBasicAuthHandler()
          basic.add_password(
              realm=realm, uri=url, user=user, passwd=password
          )
          digest = _HTTPDigestAuthHandler()
          digest.add_password(
              realm=realm, uri=url, user=user, passwd=password
          )
          _install_opener(
              _build_opener(basic, digest)
          )