Changed apache mod_proxy_fcgi configuration in vhost.conf.master from ProxyPassMatch to SetHandler so we can wrap the config directive it into <Directory ...> to avoid side affects with globally installed applications like phpmyadmin and roundcube.

ISPConfig itself does not read nor interpret this header, but there might be other
server components like PHP that might interact with it so I'll disable it just to be sure.

After enabling "Rewrite HTTP to HTTPS" and "Lets Encrypt SSL" the RewriteCond and RewriteRule got on the same line, becourse of an failing newline

Set default env[PATH] and env[HOSTNAME] since it is cleared by default setting clear_env = yes in php-fpm

Replace fastcgi_pass unix:/var/run/php5-fpm.sock; with fastcgi_pass unix:{fpm_socket}; in phpmyadmin and squirrelmail blocks, as they are considered apps and should use the same (apps.sock) listener.

Adding SSLStaplingCache shmcb:/var/run/ocsp(128000) to vhost template conf if apache version >= 2.4 and ssl enabled

- backported patches