Merge branch 'node_fix_test_hang' into node_run_tests_py

src/node/client.js

src/node/examples/math_server.js

src/node/interop/interop_client.js

src/node/server.js

src/node/surface_client.js

src/node/surface_server.js

src/node/test/interop_sanity_test.js