docs: def set_(filename, section, parameter, value):
      '''
      Set a value in an OpenStack configuration file.
  
      filename
          The full path to the configuration file
  
      section
          The section in which the parameter will be set
  
      parameter
          The parameter to change
  
      value
          The value to set
  
      CLI Example:
  
      .. code-block:: bash
  
          salt-call openstack_config.set /etc/keystone/keystone.conf sql connection foo
      '''
  
      filename = _quote(filename)
      section = _quote(section)
      parameter = _quote(parameter)
      value = _quote(six.text_type(value))
  
      result = __salt__['cmd.run_all'](
              'openstack-config --set {0} {1} {2} {3}'.format(
                  filename, section, parameter, value
                  ),
              python_shell=False,
              )
  
      if result['retcode'] == 0:
          return result['stdout']
      else:
          raise salt.exceptions.CommandExecutionError(result['stderr'])