apache: Handle transition to php 7.4

Sunil Mohan Adaparequested to merge
sunilmohan/freedombox:php-fpm-7.4 into master

Directory /etc/php/7.4 became available before php7.4-fpm became available. Handle this by checking the run time socket of the fpm daemon instead of the directory.

Discussed and tested in https://discuss.freedombox.org/t/mediawiki-service-unavailable/711/23

Signed-off-by: Sunil Mohan Adapa sunil@medhas.org

We still need to test this with Debian stable. I could use some help here as I don't have a stable setup around to test.

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