message: Add retries to ctpu deletion.
diff: @@ -110,10 +110,14 @@ function ctpu_delete {
  export TPU_ZONE="$(cat "${TF_GFILE_DIR}/tpu_zone")"
  # TODO(rsopher): conditionally save (and load) TPU_PROJECT if it was specified.
  + # Retry due to rare race condition where TPU creation hasn't propagated by
  + # the time we try to delete it.
  + for i in 1 2 3; do
  ./ctpu delete \
  --project=tensorflow-testing \
  --zone="${TPU_ZONE}" \
  --name="${TPU_NAME}" \
  --tpu-only \
  - -noconf
  + -noconf && break || sleep 60
  + done
  }
  