Unit tests are failing in the generated client for google/cloud/video/livestream/v1 here.

Steps to reproduce

• clone googleapis-gen and cd in to the directory google/cloud/video/livestream/v1/video-livestream-v1-py
• run the python post processor image in the root of google/cloud/video/livestream/v1/video-livestream-v1-py using

docker run --user $(id -u):$(id -g) --rm -v $(pwd):/repo -w /repo gcr.io/cloud-devrel-public-resources/owlbot-python:latest

• run unit tests for python 3.8 with nox -s unit-3.8
• The majority of tests fail with 'property' object is not callable

See stacktrace in screenshot below.

create_channel appears in the same class as both a property and a method. I believe this is due to the fact that there is an rpc with the name CreateChannel here which is converted to snake case as create_channel.