Kill server after 30 seconds

Summary: Bring timeout from 15min to 30seconds.

Reviewed By: passy

Differential Revision: D46726959

fbshipit-source-id: cae1fdd4668fc5237ad0f187385f3a63a51c4797

desktop/flipper-server-core/src/server/attachSocketServer.tsx

@@ -246,7 +246,7 @@ export function attachSocketServer(
             console.info('Shutdown as no clients are currently connected');
             process.exit(0);
           }
-        }, 15 * 60 * 1000);
+        }, 30 * 1000);
       }
 
       connected = false;