add exclude entry to karma config

Author: AllanZhengYP

packages/service-types-generator/src/SmokeTestGenerator.ts

@@ -145,7 +145,8 @@ module.exports = function(config) {
             }
         },
         singleRun: true,
-        concurrency: Infinity
+        concurrency: Infinity,
+        exclude: ['**/*.d.ts']
     });
 };
 `.trim();