net: report uv_tcp_open() errors

uv_tcp_open() can fail. Prior to this commit, any error was
being silently ignored. This commit raises the errors.

PR-URL: https://github.com/nodejs/node/pull/21428


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>