Adds an entry for a configuration setting.

    Args:
      key: The name of the setting.
      val: The value of the setting.

def _ParseEntry(self, key, val):
    """Adds an entry for a configuration setting.

    Args:
      key: The name of the setting.
      val: The value of the setting.
    """
    if key in self._repeated:
      setting = self.section.setdefault(key, [])
      setting.extend(val)
    else:
      self.section.setdefault(key, val)