When using the mod_ssl state on Red Hat family systems the httpd
server will currently not start.

This is due to duplicate Listen directives provided in the
ssl.conf file shipped with the mod_ssl rpm package and the directives
configured by saltstack.

The easy solution is to just ensure the rpm shipped mod_ssl is removed.

* [ssl] [debian] manage ssl.conf with pillars
* [apache] make cyphersuite a list
* [apache/ssl] switch back to strings, lists merge is not good

Other states in this formula allow changing the Apache httpd or module
package on RHEL/CentOS, e.g., one may use packages from the httpd24
SCL to install newer versions than in the base repositories.  This
changes the apache.mod_ssl SLS to match them.

- Added more modules and configuration options
 - Renamed sls files to reflect what they do.
 - added mpm options for Debian