Comment 3 for bug 1899611

debian/apache2.install contains:

debian/bash_completion/a2enmod /usr/share/bash-completion/completions/
debian/config-dir/* /etc/apache2
debian/a2enmod /usr/sbin
...

We need to backport the changes for apache2.install list config-dir contents more explicitly:

debian/config-dir/*-available /etc/apache2
debian/config-dir/*.conf /etc/apache2
debian/config-dir/envvars /etc/apache2
debian/config-dir/magic /etc/apache2

This covers all the items in Xenial's config-dir that we want, i.e.:

$ ls config-dir/
apache2.conf.in conf-available/ envvars magic mods-available/ ports.conf sites-available/