Replace deprecated `util.puts()` and `util.debug()` with console commands

As previously attempted in http-party/node-http-proxy#1307

Following the deprecation recommendation in http documentation:

• https://nodejs.org/docs/latest-v8.x/api/util.html#util_util_puts_strings
• https://nodejs.org/docs/latest-v8.x/api/util.html#util_util_error_strings