Capture previous command exit code in integration tests cleanup (#2503)

* show previous response code

* log previous response code of shell script command

test/tests/test_function_timeout.sh

@@ -17,6 +17,7 @@ fn=nodejs-hello-$TEST_ID
 export FISSION_ROUTER=localhost:8888
 
 cleanup() {
+    echo "previous response" $?
     log "Cleaning up..."
     clean_resource_by_id $TEST_ID
     rm -rf $tmp_dir