Add mod_pagespeed

[guiyomh]

https://developers.google.com/speed/pagespeed/module/

In containers :

• webdevops/apache
• webdevops/nginx
• webdevops/php-apache
• webdevops/php-apache-dev
• webdevops/php-nginx
• webdevops/php-nginx-dev

=> create a role for provisioned pagespeed

[segnini75]

any update with this task? thanks :)