Is the first sllep delete affecting the later start? (#12495)

tests/util/samples.sh

@@ -47,11 +47,6 @@ cleanup_bookinfo_sample() {
 }
 
 startup_sleep_sample() {
-    # TODO: how to make sure previous test cleaned up everything?
-    set +e
-    kubectl delete pods -l app=sleep --force
-    set -e
-
     kubectl apply -f samples/sleep/sleep.yaml -n default
     _wait_for_deployment default sleep
 }