setting to use php-fpm ondemand by default
rfe: add a setting to use php-fpm ondemand mode by default.
Could be set server-wide under Server Config, and/or put into additional php versions for folks who might need to run really old php versions.
This is a good resource saver for servers with a lot of sites or vps with limited resources. As mentioned at https://www.howtoforge.com/community/threads/php-fpm-default-process-manager.57175/ you can change your local vhost template in a conf-custom file to do this, but then of course you have to start maintaining more conf-custom files, and I suspect most folks won't take the time to do so. Setting per-site is also an option, but you must remember/train people to do so. Need to make it the default when possible (any current OS version).