Container: remove unused message exports (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/container/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:75bc07ef34a1de9895c18af54dc503ed3b3f3b52e85062e3360a979d2a0741e7
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/container/artman_container_v1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/container-v1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/container/v1/cluster_service.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/container-v1/google/cloud/container_v1/proto/cluster_service.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/container-v1/google/cloud/container_v1/proto.
synthtool > Replaced '(^.*$\\n)*' in google/cloud/container_v1/proto/cluster_service_pb2.py.
synthtool > Replaced 'nodePool>\\n' in google/cloud/container_v1/proto/cluster_service_pb2.py.
synthtool > Replaced '(\\s+)`__ instead' in google/cloud/container_v1/proto/cluster_service_pb2.py.
.coveragerc
.flake8
MANIFEST.in
noxfile.py.j2
setup.cfg
Running session blacken
Creating virtualenv using python3.6 in /tmpfs/src/git/autosynth/working_repo/container/.nox/blacken
pip install --upgrade black
black google tests docs
reformatted /tmpfs/src/git/autosynth/working_repo/container/google/cloud/container_v1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/container/google/cloud/container_v1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/container/google/cloud/container_v1/gapic/transports/cluster_manager_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/container/google/cloud/container_v1/gapic/cluster_manager_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/container/google/cloud/container_v1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/container/google/cloud/container_v1/proto/cluster_service_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/container/google/cloud/container_v1/gapic/cluster_manager_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/container/tests/unit/gapic/v1/test_cluster_manager_client_v1.py
reformatted /tmpfs/src/git/autosynth/working_repo/container/google/cloud/container_v1/proto/cluster_service_pb2.py
All done! ✨ 🍰 ✨
9 files reformatted, 8 files left unchanged.
Session blacken was successful.
synthtool > Cleaned up 2 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[tseaver]

• BigQuery systest tear-down failure due to BigQuery: bucket creation fails with 429 in systest 'test_extract_table'. #7300 (unrelated).
• Bigtable snippet failure due to Bigtable: systests leaking instances #7003 (unrelated).
• Firestore systest failure due to Firestore: 'test_watch_collection' systest flakes #7130 (unrelated).
• Storage systest failure due to quota / rate limiting on bucket creation / deletion (unrelated).

[tseaver]

Container test failures are troubling:

unningsessionunit-2.7Creatingvirtualenvusingpython2.7in/tmpfs/src/github/google-cloud-python/container/.nox/unit-2-7pipinstall--upgrademockpytestpytest-covpipinstall--upgrade-e ../api_corepipinstall--upgrade-e ../corepipinstall--upgrade-e .
py.test--quiet--cov=google.cloud--cov=tests.unit--cov-append--cov-config=.coveragerc--cov-report=--cov-fail-under=76tests/unit
............................................................ [100%]Coverage.pywarning: Moduletests.unitwasneverimported. (module-not-imported)
Requiredtestcoverageof76%reached. Totalcoverage: 100.00%60passedin0.81secondsSessionunit-2.7wassuccessful.
Runningsessionunit-3.5Creatingvirtualenvusingpython3.5in/tmpfs/src/github/google-cloud-python/container/.nox/unit-3-5pipinstall--upgrademockpytestpytest-covpipinstall--upgrade-e ../api_corepipinstall--upgrade-e ../corepipinstall--upgrade-e .
py.test--quiet--cov=google.cloud--cov=tests.unit--cov-append--cov-config=.coveragerc--cov-report=--cov-fail-under=76tests/unit
............................................................ [100%]Coverage.pywarning: Modulegoogle.cloudwaspreviouslyimported, butnotmeasured (module-not-measured)
Coverage.pywarning: Moduletests.unitwasneverimported. (module-not-imported)
FAILRequiredtestcoverageof76%notreached. Totalcoverage: 75.56%

I cannot reproduce on my local machine, although I do see the coverage warnings during the unit test runs, and the same missing coverage lines in google/cloud/__init__.py and google/cloud/container.py.

[tseaver]

Unrelated test failures (shouldn't have run, karthago delenda est):

• bigquery: flaky systest teardown, see BigQuery: bucket creation fails with 429 in systest 'test_extract_table'. #7300.
  bigtable`: new lint failure, fixed in bigtable: fix lint #7312.
• firestore: flaky watch systest, see Firestore: 'test_watch_collection' systest flakes #7130.
• irm: Kokoro internal error
• storage: flaky systests, see Storage: 'test_notification_minimal' flakes with 429. #7384, Storage: test_lifecycle_rules flakes with 529 #7385.

[tseaver]

As with #7262 and #7263, the coverage-related failures here are mysterious.

[busunkim96]

Closing this to force a regen.