old_contents: 
  default_settings = [
          ('auth_url', str, 'http://localhost:5000/v3'),
          ('region', str, 'RegionOne'),
          ('user_domain_name', str, 'Default'),
          ('cacert', str, ''),
  ]
  
  def parse_settings(settings):
      parsed = {}
  
      def populate(name, convert, default):
          sname = '%s%s' % ('keystone.', name)
          value = convert(settings.get(sname, default))
          parsed[sname] = value
  
      for name, convert, default in default_settings:
          populate(name, convert, default)
  
      return parsed
  
  def includeme(config):
      """ Set up standard configurator registrations.  Use via:
  
      .. code-block:: python
  
         config = Configurator()
         config.include('pyramid_keystone')
      """
  
  
new_contents: 
  default_settings = [
          ('auth_url', str, 'http://localhost:5000/v3'),
          ('region', str, 'RegionOne'),
          ('user_domain_name', str, 'Default'),
          ('cacert', str, ''),
  ]
  
  def parse_settings(settings):
      parsed = {}
  
      def populate(name, convert, default):
          sname = '%s%s' % ('keystone.', name)
          value = convert(settings.get(sname, default))
          parsed[sname] = value
  
      for name, convert, default in default_settings:
          populate(name, convert, default)
  
      return parsed
  
  def includeme(config):
      """ Set up standard configurator registrations.  Use via:
  
      .. code-block:: python
  
         config = Configurator()
         config.include('pyramid_keystone')
  
      """
  
      # We use an action so that the user can include us, and then add the
      # required variables, upon commit we will pick up those changes.
      def register():
          registry = config.registry
          settings = parse_settings(registry.settings)
  
          registry.settings.update(settings)
  
      config.action('keystone-configure', register)
  
subject: Add configurator action