import product sets: should import a Product Set failed

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commit: ed5c7a0
buildURL: Build Status, Sponge
status: failed

Test output

Command failed: node productSearch/importProductSets long-door-651 us-west1 gs://cloud-samples-data/vision/product_search/product_sets.csv
16 UNAUTHENTICATED: Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.
Error: Command failed: node productSearch/importProductSets long-door-651 us-west1 gs://cloud-samples-data/vision/product_search/product_sets.csv

16 UNAUTHENTICATED: Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.
at checkExecSyncError (child_process.js:635:11)
at Object.execSync (child_process.js:671:15)
at execSync (system-test/importProductSets.test.js:22:28)
at Context.<anonymous> (system-test/importProductSets.test.js:42:20)
at processImmediate (internal/timers.js:461:21)</pre></details>