apache: change template to load mpm worker module

in apache 2.4

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
(cherry picked from commit 35c9cae84c7964ad96381c7455c40e43dd6b4a8d)
apache: switch to use the apache worker mpm

Fixes: #9169

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
(cherry picked from commit c3b53c326558dd3dd435c9e3fdbc07d8c15f4e68)