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

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

Add Python Client to Test Negative HTTP2 Conditions

Documentation for the new tests can be found https://github.com/grpc/grpc/blob/master/doc/negative-http2-interop-test-descriptions.md

grpclb: skip slash in server uri path if present

Add negative http2 interop description file

Manual changes:

 - Fixed use of Exception.message in _invalid_metadata_test.py

 - Fixed merge of one_failed_as_unavailable in rpc_server_spec.rb

 - Added "set -e" to generate_build_additions.sh

Modify HTTP/2 test server's command-line arguments

don't print multiple imports to protobuf modules

Add grpc_pollset_set to grpc_resolve_address

Deflake lb_policies_test

Make event order consistent, and make 'end' and 'error' mutually exclusive

Add copyright to new files