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

* show previous response code

* log previous response code of shell script command

test/tests/websocket/test_ws.sh

@@ -8,6 +8,7 @@ set -euo pipefail
 source $(dirname $0)/../../utils.sh
 
 cleanup() {
+    echo "previous response" $?
     log "Deleting websocket setup"
     fission spec destroy 
 }