Update Python examples with fresh generated code.

Rename interop-as-a-unit-test "intraop".

Set Python documentation copyright

It's been confusing that these tests have been called "interop" but
are not actually tests of interoperation.

Merge pull request #9206 from soltanmm-google/is-the-world-is-moving-too-fast-or-am-I-moving-too-slow

Add `auto-gen`d comment to `_pb2_grpc.py` files

Remove for loop initial declarations

Some of these files contain the magic string "DO NOT EDIT" but we do
not wish for our tests to depend upon that.

Check and fail if user provides a metadata key starting with :

Fix jwt verifier

Cleanup and speedup sanity tests

Fix Python artifact build

Update interop html template location

Ruby: show error class and message instead of unknown

Clean up tools/run_tests directory

Better qps_json_driver message when QPS_WORKERS env is missing

- Initializes grpc correctly in the JWT utils.
- Make the email mapping work with the new service accounts produced by
  Google IAM.
- Adding check for email issuers where the issuer has to be the subject as well.
- Implementing portable version of memrchr.

Change grpcio_tools to grpcio-tools

allow disable core_list setting and override qps server in benchmarks

Support --exclude in run_tests_matrix.py

This should address the difference in how we ask users to install
grpcio-tools and the files the user ends up downloading from PyPI.

Allow running many runs per test without flooding the logs

Reintroduce test timeouts eliminated by mistake

Get wrapped endpoint's fd in secure_endpoint's endpoint_get_fd

Fix metrics server

v1.0.x manual upmerge