Delete webserver::apache::module

Replaced by apache::mod::* hierarchy.

Including ::apache::mod::ssl from within webserver::apache would land us with
a parser bug. So as temporary workaround, include apache::mod::ssl alongside
the only instantiation of webserver::apache::site for which the if guard would
be true (librenms).

The entire webserver::apache::* hierarchy will be deleted by follow-up commits,
so it's OK for now.

Change-Id: Ia6e5ec8ad80f7996b679db327c30b8e1c503a114