update server test

tests/inputs/server_config.json

@@ -3,9 +3,11 @@
     "tts_config":"dummy_model_config.json",     // tts config.json file
     "tts_speakers": null,           // json file listing speaker ids. null if no speaker embedding.
     "wavernn_lib_path": null,   // Rootpath to wavernn project folder to be imported. If this is null, model uses GL for speech synthesis.
-    "wavernn_path": null,  // wavernn model root path
     "wavernn_file": null, // wavernn checkpoint file name
     "wavernn_config": null, // wavernn config file
+    "pwgan_lib_path": null,
+    "pwgan_file": null,
+    "pwgan_config": null,
     "is_wavernn_batched":true, 
     "port": 5002,
     "use_cuda": false,