[ftr] accept the project name as an unnamed arg

src/functional_test_runner/cli.js

@@ -6,12 +6,11 @@ import { createToolingLog } from '../utils';
 import { createFunctionalTestRunner } from './functional_test_runner';
 
 const cmd = new Command('node scripts/functional_test_runner');
-
 const resolveConfigPath = v => resolve(process.cwd(), v);
-const defaultConfigPath = resolveConfigPath('test/functional/config.js');
 
 cmd
-  .option('--config [path]', 'Path to a config file', resolveConfigPath, defaultConfigPath)
+  .usage('[options] [project]')
+  .option('--config [path]', 'Path to a config file', resolveConfigPath)
   .option('--bail', 'stop tests after the first failure', false)
   .option('--grep <pattern>', 'pattern used to select which tests to run')
   .option('--verbose', 'Log everything', false)
@@ -21,10 +20,8 @@ cmd
   .parse(process.argv);
 
 if (!cmd.config) {
-  console.log('');
-  console.log('  --config is a required parameter');
-  console.log('');
-  process.exit(1);
+  const [project = 'functional'] = cmd.args;
+  cmd.config = resolveConfigPath(`test/${project}/config.js`);
 }
 
 let logLevel = 'info';