401 Unauthorized error in e2e tests

[yuzisun]

/kind bug

What steps did you take and what happened:

 when make API call

  client = k8s_client.ApiClient()
  crd_api = k8s_client.CustomObjectsApi(client)
  return crd_api.get_namespaced_custom_object(
    GROUP, VERSION, namespace, PLURAL, name)

Every 15 mins, the attached token has to be refreshed otherwise 401 Unauthorized.

E.g, check prow build logs (Not Argo Workflow) and you can see every 15mins, 401 Unauthorized error surfaces, http://prow.kubeflow-testing.com/view/s3/aws-kubeflow-jenkins/pr-logs/pull/kubeflow_kfserving/1315/kubeflow-kfserving-presubmit/1357497548171907072

The way that we handle it is add retry logic to refresh the API call.

https://github.com/kubeflow/testing/blob/master/py/kubeflow/testing/argo_client.py#L87-L105

**What did you expect to happen:**


**Anything else you would like to add:**
[Miscellaneous information that will assist in solving the issue.]


**Environment:**

- Istio Version:
- Knative Version:
- KFServing Version:
- Kubeflow version:
- Kfdef:[k8s_istio/istio_dex/gcp_basic_auth/gcp_iap/aws/aws_cognito/ibm]
- Minikube version:
- Kubernetes version: (use `kubectl version`):
- OS (e.g. from `/etc/os-release`):

[yuzisun]

kubernetes-client/python-base#125

[yuzisun]

fixed by recreating the KFServing client every time.