puppetlabs-apache : Customized stapling_cache parameter for mod SSL

Currently, the value of the SSLStaplingCache parameter of mod SSL is based on a sensible value (hardcoded) based on the OS.

I am working on a Pull Request to add a stapling_cache parameter to the apache::mod::ssl class so that the value of SSLStaplingCache can be customized.

This parameter will work like this :

 - if it is set to undef (the default value), the actual behavior will take place (SSLStaplingCache will be set to a sensible value based on the OS)

 - if is is set to a string, this string will used as a value for SSLStaplingCache.

Here is the relevant Apache documentation :

https://httpd.apache.org/docs/2.4/mod/mod_ssl.html#sslstaplingcache