fix ci

tools/serving_build.sh

@@ -892,6 +892,7 @@ EOF
             #    exit 1
             #fi
             #ps -ef | grep "web_service" | grep -v grep | awk '{print $2}' | xargs kill
+            #kill_server_process
             #cd ..
             ;;
         GPU)
@@ -907,6 +908,7 @@ EOF
                 exit 1
             fi
             ps -ef | grep "web_service" | grep -v grep | awk '{print $2}' | xargs kill
+            kill_server_process
 
             python local_pipeline_server.py >/dev/null &
             sleep 5
@@ -918,6 +920,7 @@ EOF
                 exit 1
             fi
             ps -ef | grep "web_service" | grep -v grep | awk '{print $2}' | xargs kill
+            kill_server_process
             cd .. # pwd: /Serving/python/examples/pipeline
             ;;
         *)