add grpc port settings

Author: cceyda

torchserve_dashboard/default.torchserve.properties

@@ -4,5 +4,7 @@ metrics_address=http://127.0.0.1:8445
 number_of_gpu=0
 batch_size=1
 model_store=/mnt/pretrained/model_store
+grpc_inference_port=7070
+grpc_management_port=7071
 #install_py_dep_per_model=true
-#enable_metrics_api=false
+#enable_metrics_api=false