test: remove obsolete TODO comments

Not using test_ca.pem in these files anymore.
Using elipses.txt which has multibyte chars.
Not clear what constitutes "large" but that
can be a different ticket if elipses.txt etc.
are insufficiently large.

PR-URL: https://github.com/nodejs/io.js/pull/2032


Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>