compute: should return a helpful message on request response.statusCode 404 failed

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---

commit: 070ec96
buildURL: Build Status, Sponge
status: failed

Test output

The input did not match the regular expression /A Not Found error was returned while attempting to retrieve an accesstoken for the Compute Engine built-in service account. This may be because the Compute Engine instance does not have any permission scopes specified./. Input:
'FetchError: request to http://169.254.169.254/computeMetadata/v1/instance/service-accounts/default/token failed, reason: Nock: No match for request {\n' +

'  "method": "GET",\n' +

'  "url": "http://169.254.169.254/computeMetadata/v1/instance/service-accounts/default/token",\n' +

'  "headers": {\n' +

'    "metadata-flavor": [\n' +

'      "Google"\n' +

'    ],\n' +

'    "accept": [\n' +

'      "/"\n' +

'    ],\n' +

'    "user-agent": [\n' +

'      "node-fetch/1.0 (+https://github.com/bitinn/node-fetch)"\n' +

'    ],\n' +

'    "accept-encoding": [\n' +

'      "gzip,deflate"\n' +

'    ],\n' +

'    "connection": [\n' +

'      "close"\n' +

'    ]\n' +

'  }\n' +

'}'
AssertionError [ERR_ASSERTION]: The input did not match the regular expression /A Not Found error was returned while attempting to retrieve an accesstoken for the Compute Engine built-in service account. This may be because the Compute Engine instance does not have any permission scopes specified./. Input:
'FetchError: request to http://169.254.169.254/computeMetadata/v1/instance/service-accounts/default/token failed, reason: Nock: No match for request {\n' +

'  "method": "GET",\n' +

'  "url": "http://169.254.169.254/computeMetadata/v1/instance/service-accounts/default/token",\n' +

'  "headers": {\n' +

'    "metadata-flavor": [\n' +

'      "Google"\n' +

'    ],\n' +

'    "accept": [\n' +

'      "/"\n' +

'    ],\n' +

'    "user-agent": [\n' +

'      "node-fetch/1.0 (+https://github.com/bitinn/node-fetch)"\n' +

'    ],\n' +

'    "accept-encoding": [\n' +

'      "gzip,deflate"\n' +

'    ],\n' +

'    "connection": [\n' +

'      "close"\n' +

'    ]\n' +

'  }\n' +

'}'
at runMicrotasks (<anonymous>)
at processTicksAndRejections (internal/process/task_queues.js:97:5)
at async Context.<anonymous> (build/test/test.compute.js:137:9)
    -> /workspace/test/test.compute.ts:169:5</pre></details>

[flaky-bot]

Test passed for commit fe84049 (Build Status, Sponge)! Closing this issue.