fix artifact dir

[lluunn]

junit_kubeflow-deploy-bootstrapper.xml is at wrong location.

gsutil ls gs://kubernetes-jenkins/logs/kubeflow-riodic-master/761
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/build-log.txt
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/finished.json
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/junit_kubeflow-deploy-bootstrapper.xml
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/started.json
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/artifacts/

gsutil ls gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/artifacts
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/artifacts/junit_jsonnet-test-suite.xml
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/artifacts/junit_jupyter-test.xml
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/artifacts/junit_kubeflow-deploy-deploy-argo-test-argo-deploy.xml
gs://kubernetes-jenkins/logs/kubeflow-periodic-master/761/artifacts/junit_kubeflow-deploy-deploy-minikube.xml
...

/cc @kunmingg
/cc @jlewi

---

This change is 

[lluunn]

notebook test might be flaky: http://testing-argo.kubeflow.org/workflows/kubeflow-test-infra/kubeflow-presubmit-kfctl-2449-e9ea4dd-5594-b698?tab=workflow&nodeId=kubeflow-presubmit-kfctl-2449-e9ea4dd-5594-b698-415398778

[lluunn]

/retest

[jlewi]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jlewi

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[lluunn]

/retest