The mod_ssl package name could be overridden in apache:lookup:mod_ssl.
Due to the way lookup keys are merged into the main apache dictionary,
the package name clashed with the mod_ssl configuration defined under
apache:mod_ssl.
Fix that by renaming the mod_ssl package variable to mod_ssl_pkg.
Drive-By: Add mod_ssl_pkg to the pillar.example file.
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.
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.
