add some more specs for the hardening code

TelekomLabs-DCO-1.1-Signed-off-by: Edmund Haselwanter <me@ehaselwanter.com>
(github: ehaselwanter)
@ehaselwanter Maybe I missed something, but from my current understanding, that does not match the requirements here: https://github.com/TelekomLabs/chef-apache-hardening/blob/master/recipes/hardening.rb#L46