Log Message:
Update lang/nodejs to 9.4.0.

async_hooks:
- deprecate AsyncHooks Sensitive API and runInAsyncIdScope. Neither
  API were documented.
deps:
- update nghttp2 to 1.29.0
- upgrade npm to 5.6.0
- cherry-pick 50f7455 from upstream V8
events:
- remove reaches into _events internals
http:
- add rawPacket in err of clientError event
http2:
- implement maxSessionMemory
- add initial support for originSet
- add altsvc support
- perf_hooks integration
- Refactoring and cleanup of Http2Session and Http2Stream destroy
net:
- remove Socket.prototype.write
- remove Socket.prototype.listen
repl:
- show lexically scoped vars in tab completion
stream:
- rm {writeable/readable}State.length
- add flow and buffer properties to streams
util:
- allow wildcards in NODE_DEBUG variable
zlib:
- add ArrayBuffer support