default php-fpm to use ondemand mode

Jesse Norellrequested to merge
jnorell/ispconfig3:4109 into stable-3.1

default php-fpm to use ondemand mode

Fixes #4109 (closed)

See https://www.howtoforge.com/community/threads/php-fpm-default-process-manager.57175/

Edited by Marius Burkard

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