Summaries are not generated for new storage tests

[wojtek-t]

In some of the newly introduced storage tests, pod_startup_latency summaries aren't generated.

E.g. in this run:
https://gcsweb.k8s.io/gcs/kubernetes-jenkins/logs/ci-kubernetes-storage-scalability-max-configmap-vol-per-pod/1153307037698887684/
clearly it was measured, it was even logged as violated, but no .json file exists

What is interesting, in other tests sharing the same test-config (just different overrides), it works fine, e.g.:
https://gcsweb.k8s.io/gcs/kubernetes-jenkins/logs/ci-kubernetes-storage-scalability-max-emptydir-vol-per-pod/1153307037698887682/

[wojtek-t]

@mucahitkurt - this is the problem you had

[wojtek-t]

hmm - I think I see what is happening - let me send a PR.