apache-mpm-prefork is not needed on Debian

[rickysarraf]

On current debian box, we don't need the mpm-prefork etc packages.

Commenting out the prefork check helps proceed the configuration

Below is the deprecation statement from the Debian Apache pacakge.

00:59:47 rrs@zan:~$ apt-cache show apache2-mpm-prefork
Package: apache2-mpm-prefork
Source: apache2
Version: 2.4.7-1
Installed-Size: 22
Maintainer: Debian Apache Maintainers debian-apache@lists.debian.org
Architecture: amd64
Provides: httpd, httpd-cgi
Depends: apache2 (= 2.4.7-1)
Description-en: transitional prefork MPM package for apache2
This is a transitional package to apache2 for users of apache2-mpm-prefork and
can be safely removed after the installation is complete.
Description-md5: 2a27f385dd2020da306403c3748102b7
Homepage: http://httpd.apache.org/
Tag: implemented-in::c, interface::daemon, network::server, network::service,
protocol::http, protocol::ipv6, role::program, suite::apache,
web::server, works-with-format::html, works-with::text
Section: oldlibs
Priority: extra
Filename: pool/main/a/apache2/apache2-mpm-prefork_2.4.7-1_amd64.deb
Size: 1420
MD5sum: 2bc2ce62a9862752a3de7b5a14167cee
SHA1: abda4ae10c5eb51390603a70305e1ede8ed2347f
SHA256: bf5bac5b1c55b797550767733fd1d9c1f62c0272be4c1ad1f097b54eb5b8b272