kubernetes: pull-kubernetes-federation-e2e-gce flaking because `Your "OAuth 2.0 Service Account" credentials are invalid`

Examples: https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/pr-logs/pull/49107/pull-kubernetes-federation-e2e-gce/16140/ https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/pr-logs/pull/49266/pull-kubernetes-federation-e2e-gce/16109/

/go/src/k8s.io/kubernetes/_output/gcs-stage/v1.8.0-alpha.2.558+6d2ef8a8be76e7/kubernetes-test.tar.gz.sha1 /go/src/k8s.io/kubernetes/_output/gcs-stage/v1.8.0-alpha.2.558+6d2ef8a8be76e7/kubernetes.tar.gz /go/src/k8s.io/kubernetes/_output/gcs-stage/v1.8.0-alpha.2.558+6d2ef8a8be76e7/kubernetes.tar.gz.md5 /go/src/k8s.io/kubernetes/_output/gcs-stage/v1.8.0-alpha.2.558+6d2ef8a8be76e7/kubernetes.tar.gz.sha1 gs://kubernetes-release-pull/ci/pull-kubernetes-federation-e2e-gce/v1.8.0-alpha.2.558+6d2ef8a8be76e7/
I0720 18:45:12.859] Your "OAuth 2.0 Service Account" credentials are invalid. Please run
I0720 18:45:12.860]   $ gcloud auth login
I0720 18:45:12.860] Duplicate type [0:0:4]
I0720 18:45:24.339] CommandException: 1 file/object could not be transferred.
I0720 18:45:24.453] FAILED
I0720 18:45:24.456] 
I0720 18:45:24.460]