AutoML: sort generated classes (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/automl/synth.py. synthtool > Ensuring dependencies. synthtool > Pulling artman image. latest: Pulling from googleapis/artman Digest: sha256:d6c8ced606eb49973ca95d2af7c55a681acc042db0f87d135968349e7bf6dd80 Status: Image is up to date for googleapis/artman:latest synthtool > Cloning googleapis. synthtool > Running generator for google/cloud/automl/artman_automl_v1beta1.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/automl-v1beta1. synthtool > Replaced 'metadata_type=operations_pb2.OperationMetadata' in google/cloud/automl_v1beta1/gapic/auto_ml_client.py. synthtool > No replacements made in google/cloud/automl_v1beta1/gapic/prediction_service_client.py for pattern ^\s+::, maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/automl_v1beta1/gapic/auto_ml_client.py for pattern ^(\s+)(::) \s+?([^\s]), maybe replacement is not longer needed? .coveragerc .flake8 MANIFEST.in noxfile.py.j2 setup.cfg Running session blacken Creating virtualenv using python3.6 in /tmpfs/src/git/autosynth/working_repo/automl/.nox/blacken pip install --upgrade black black google tests docs reformatted /tmpfs/src/git/autosynth/working_repo/automl/google/cloud/automl.py reformatted /tmpfs/src/git/autosynth/working_repo/automl/google/cloud/automl_v1beta1/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/automl/google/cloud/automl_v1beta1/gapic/enums.py reformatted /tmpfs/src/git/autosynth/working_repo/automl/google/cloud/automl_v1beta1/gapic/prediction_service_client_config.py reformatted /tmpfs/src/git/autosynth/working_repo/automl/google/cloud/automl_v1beta1/gapic/auto_ml_client_config.py reformatted /tmpfs/src/git/autosynth/working_repo/automl/google/cloud/automl_v1beta1/gapic/transports/prediction_service_grpc_transport.py reformatted 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Session blacken was successful. synthtool > Cleaned up 2 temporary directories. synthtool > Wrote metadata to synth.metadata. 

[tseaver]

Same weird / bad imports as #7224.

[crwilcox]

@tseaver reviewed this earlier and I regen'd. There are removed imports and added imports with no usage attached. This is suspicious.

[tseaver]

I've just tried regenerating locally:

• The new unused imports are present, and do not trigger any lint issues, even when I remove the exclusion of gapic from .flake8. I have no clue why not.
• The same removed imports as Asset: remove unused message exports (via synth). #7262, BigQuery DataTransfer: remove unused message exports (via synth). #7263, Container: remove unused message exports (via synth). #7265, and Texttospeech: remove unused message exports (via synth). #7277 now cause coverage to fail.

[tseaver]

There are plenty of other examples of unused imports in GAPIC-generated code, so I think that it should not be a blocker here, even though I don't understand why.