* Feature (rhel7/httpd 2.4) : hardening apache and code refactoring

* remove hard returns

* Add default Listen 80 in httpd.conf

In case there no vhosts defined in pillar httpd will listen on port 80.
 Without this default it will not start

* empty file autoindex.conf instead of deleting it

* explicit hardening items and references from CIS

* add #3.5 hardening rule

* explain CIS recommendations categories

* add dependencies before start service

* add recommendation #7.1 Install mod_ssl

* link in readme to hardening doc