BigQuery snippets have started failing "consistently"

[dhermes]

See the 3 most recent BigQuery builds on master:

• https://circleci.com/gh/GoogleCloudPlatform/google-cloud-python/4382
• https://circleci.com/gh/GoogleCloudPlatform/google-cloud-python/4388
• https://circleci.com/gh/GoogleCloudPlatform/google-cloud-python/4390

[tswast]

Yeah, that looks pretty consistent. Investigating.

[tswast]

I think BigQuery may have started validating access entry updates recently. I'll see if I can dig up a valid domain / email we can use for a sample.