net: move debug statement

This will allow `localAddress` to be properly set before writing
debug output.

PR-URL: https://github.com/nodejs/node/pull/12616


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>