Asset: 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/asset/synth.py.
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Digest: sha256:75bc07ef34a1de9895c18af54dc503ed3b3f3b52e85062e3360a979d2a0741e7
Status: Downloaded newer image for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/asset/artman_cloudasset_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/asset/v1beta1/assets.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1beta1/google/cloud/asset_v1beta1/proto/assets.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/asset/v1beta1/asset_service.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1beta1/google/cloud/asset_v1beta1/proto/asset_service.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1beta1/google/cloud/asset_v1beta1/proto.
synthtool > Replaced 'from google.iam.v1 import policy_pb2 as' in google/cloud/asset_v1beta1/proto/assets_pb2.py.
synthtool > Replaced 'from google.iam.v1 import iam_policy_pb2_grpc as google_dot_iam_dot_v1_dot_policy__pb2' in google/cloud/asset_v1beta1/proto/assets_pb2.py.
synthtool > Replaced "_ASSET.fields_by_name\\['iam_policy'\\].message_type = google_dot_iam_dot_v1_dot_policy__pb2._POLICY" in google/cloud/asset_v1beta1/proto/assets_pb2.py.
synthtool > Replaced '          The full name of the asset. For example: ``//compute.googleapi\n          s.com/projects/my_project_123/zones/zone1/instances/instance1`\n          `. See `Resource Names <https://cloud.google.com/apis/design/r\n          esource_names#full_resource_name>`__ for more information.\n' in google/cloud/asset_v1beta1/proto/assets_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/asset/.nox/blacken
pip install --upgrade black
black google tests docs
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/gapic/asset_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/gapic/transports/asset_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/proto/assets_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/gapic/asset_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/tests/unit/gapic/v1beta1/test_asset_service_client_v1beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/proto/assets_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2.py
All done! ✨ 🍰 ✨
14 files reformatted, 4 files left unchanged.
Session blacken was successful.
synthtool > Cleaned up 3 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[tseaver]

@crwilcox This looks like a change to gapic-generator, as the underlying .proto files have not changed. While nothing in our code depends on having the shared messages exported from google.asset_v1beta1.types, this kind of change might be breaking for users?

[tseaver]

BigQuery systest failure due to #7300 (unrelated to this PR).

[tseaver]

Bigtable failures due to #7003 (unrelated).

[tseaver]

Asset test failures are troubling:

Running session unit-3.5
Creating virtualenv using python3.5 in /tmpfs/src/github/google-cloud-python/asset/.nox/unit-3-5
pip install --upgrade mock pytest pytest-cov
pip install --upgrade -e ../api_core
pip install --upgrade -e ../core
pip install --upgrade -e .
py.test --quiet --cov=google.cloud --cov=tests.unit --cov-append --cov-config=.coveragerc --cov-report= --cov-fail-under=79 tests/unit
....                                                                     [100%]Coverage.py warning: Module google.cloud was previously imported, but not measured (module-not-measured)
Coverage.py warning: Module tests.unit was never imported. (module-not-imported)
FAIL Required test coverage of 79% not reached. Total coverage: 78.43%

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/asset.py.

[tseaver]

@crwilcox I just checked, and putting the three unused imports back does get the coverage back above the required 79% / 80 % thressholds, which has to be bogus.

[busunkim96]

Closing this to force a regen.