gce: "before all" hook for "should get the instance" failed

[flaky-bot]

Note: #485 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

---

commit: 40bca12
buildURL: Build Status, Sponge
status: failed

Test output

Timeout of 150000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/tmpfs/src/github/nodejs-getting-started/gce/test/app.test.js)
Error: Timeout of 150000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/tmpfs/src/github/nodejs-getting-started/gce/test/app.test.js)
    at process._tickCallback (internal/process/next_tick.js:68:7)

[sofisl]

Transient failure, closing for now.