net: add symbol to normalized connect() args

This commit attaches a Symbol to the result of
net._normalizeArgs(). This prevents normal arrays from being
passed to the internal Socket.prototype.connect() bypass logic.

PR-URL: https://github.com/nodejs/node/pull/13069


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>