Merge pull request #6084 from sreecha/nodejs_stress

...e/stress_test/grpc_interop_stress_cxx/Dockerfile.template

.../stress_test/grpc_interop_stress_node/Dockerfile.template

...dockerfile/stress_test/grpc_interop_stress_cxx/Dockerfile

...ress_test/grpc_interop_stress_cxx/build_interop_stress.sh

...ockerfile/stress_test/grpc_interop_stress_node/Dockerfile

...ess_test/grpc_interop_stress_node/build_interop_stress.sh

tools/gcp/stress_test/run_client.py

tools/gcp/stress_test/run_node.sh

tools/gcp/stress_test/run_server.py

tools/gcp/stress_test/stress_test_utils.py

tools/jenkins/build_interop_stress_image.sh

tools/run_tests/stress_test/configs/asan.json

tools/run_tests/stress_test/configs/node-cxx.json

tools/run_tests/stress_test/configs/node.json

tools/run_tests/stress_test/configs/opt-tsan-asan.json

tools/run_tests/stress_test/configs/opt.json

tools/run_tests/stress_test/configs/tsan.json

tools/run_tests/stress_test/run_on_gke.py