Changes

ES2Plus_Tests.cfg: comment out parameters in config file.

The code in ES2Plus_Tests.ttcn already provides safe defaults, so we
do not have to repeat those defaults again in ES2Plus_Tests.cfg.

So let's comment out the parameters. This way we kenn keep them for
illustrative purposes, so that users can use the config file as a
helpful template for the most basic settings.

Related: SYS#7339
Change-Id: I5677222305d847ba3ac1cdafecdc942ece80aa8c