Merge branch 'master' into hpack_table

src/core/ext/resolver/sockaddr/sockaddr_resolver.c

src/csharp/Grpc.IntegrationTesting/ClientRunners.cs

...rp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj

src/csharp/Grpc.IntegrationTesting/InterarrivalTimers.cs

src/ruby/ext/grpc/rb_call.c

src/ruby/spec/generic/client_stub_spec.rb

tools/run_tests/performance/__init__.py

tools/run_tests/performance/build_performance.sh

tools/run_tests/performance/scenario_config.py

tools/run_tests/run_performance_tests.py