Werk #9357: Fix suddenly stopped apache process during reloads

When a reload is executed on the system wide apache process (which listens on port 80 and/or 443), the process could suddenly terminate with a segmentation fault.

This issue could occur during cluster setup causing it to fail.

As far as we can tell this is related to the MPM event module which is used since debian stretch by default. To fix this issue we changed back to MPM prefork (which we used before with 1.3.x).

You can do the same with 1.4.0 to workaround this issue manually by running "a2dismod mpm_event" and "a2enmod mpm_prefork" followed by "apache2ctl stop" and "apache2ctl start".

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