fix ci script

tools/serving_build.sh

@@ -628,6 +628,7 @@ function python_test_grpc_impl() {
             fi
             echo "grpc impl test success"
             kill_server_process
+            kill_process_by_port 9393
             ps -ef | grep "cube" | grep -v grep | awk '{print $2}' | xargs kill
 
             cd .. # pwd: /Serving/python/examples/grpc_impl_example
@@ -775,8 +776,6 @@ function python_test_pipeline(){
             python -m paddle_serving_server.serve --model imdb_cnn_model --port 9292 --workdir test9292 &> cnn.log &
             python -m paddle_serving_server.serve --model imdb_bow_model --port 9393 --workdir test9393 &> bow.log &
             sleep 5
-            cat cnn.log
-            cat bow.log
             
             # test: thread servicer & thread op
             cat << EOF > config.yml