ChunkedEncodingError is not retried when fetching data with list_rows()

[plamut]

Original issue: googleapis/python-bigquery-storage#242

A user reported that they saw an error in production when fetching table data with Client.list_rows(). That method uses the default retry object, which currently does not consider requests.exceptions.ChunkedEncodingError retryable.

(it does retry requests.exceptions.ConnectionError, but ChunkedEncodingError is not a subclass of that.

[andrewsg]

I think this may actually be due to googleapis/google-resumable-media-python#240 - PR for this is in the works.

Edit: @tseaver pointed out this is not a media operation, my mistake.