cannot import name 'GkeHubClient'

[parthea]

The last release version 0.2.0 has an issue where the library cannot be imported.

Steps to reproduce

1. pyenv virtualenv testgke
2. pyenv activate testgke
3. pip install google-cloud-gke-hub
4. python3
5. Run the code below

Code example

import google.cloud.gkehub_v1

Stack trace

>>> import google.cloud.gkehub_v1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/google/home/partheniou/.pyenv/versions/testgke/lib/python3.6/site-packages/google/cloud/gkehub_v1/__init__.py", line 17, in <module>
    from .services.gke_hub import GkeHubClient
  File "/usr/local/google/home/partheniou/.pyenv/versions/testgke/lib/python3.6/site-packages/google/cloud/gkehub_v1/services/gke_hub/__init__.py", line 16, in <module>
    from .client import GkeHubClient
  File "/usr/local/google/home/partheniou/.pyenv/versions/testgke/lib/python3.6/site-packages/google/cloud/gkehub_v1/services/gke_hub/client.py", line 35, in <module>
    from google.cloud.gkehub_v1.services.gke_hub import pagers
  File "/usr/local/google/home/partheniou/.pyenv/versions/testgke/lib/python3.6/site-packages/google/cloud/gkehub_v1/services/gke_hub/pagers.py", line 27, in <module>
    from google.cloud.gkehub_v1.types import feature
  File "/usr/local/google/home/partheniou/.pyenv/versions/testgke/lib/python3.6/site-packages/google/cloud/gkehub_v1/types/__init__.py", line 16, in <module>
    from .feature import (
  File "/usr/local/google/home/partheniou/.pyenv/versions/testgke/lib/python3.6/site-packages/google/cloud/gkehub_v1/types/feature.py", line 18, in <module>
    from google.cloud.gkehub import configmanagement_v1 as configmanagement_pb2  # type: ignore
  File "/usr/local/google/home/partheniou/.pyenv/versions/testgke/lib/python3.6/site-packages/google/cloud/gkehub/__init__.py", line 17, in <module>
    from google.cloud.gkehub_v1.services.gke_hub.client import GkeHubClient
ImportError: cannot import name 'GkeHubClient'

[parthea]

I was able to resolve the issue using the code in #64 by moving the dependencies configmanagement_v1 and multiclusteringress_v1 from the original location /google/cloud/gkehub to /google/cloud/gkehub_v1.

We could also solve this by publishing proto only packages for google-cloud-gke-hub-config-management and google-cloud-gke-hub-multi-clusteringress.

@busunkim96 WDYT?

[tseaver]

@parthea I prefer your solution as outlined in PR #64. IIRC, we talked about proto-only packages some years back, and decided that "multiplying the entities" was too much trouble: having them in the same repo means that new features / breaking changes in the protobuf files are easier to track in the client libraries.

[busunkim96]

@parthea 👋 Do you need help with this one? Is the P0 label still appropriate?

[parthea]

@busunkim96 I've just updated the PR with the changes as discussed. Please can you take another look? I think P0 is appropriate as the v1 client is currently broken.