var config = ConfigParams.fromTuples([
  'host', 'broker1,broker2',
  'port', ',8082',
  'username', 'user',
  'password', 'pass123',
  'param1', 'ABC',
  'param2', 'XYZ',
  'param3', null  
]);

var config2 = ConnectionUtils.include(config, ['username', 'password']);