MediaWiki Apache site: listen to *:8080 as well as *:80

Parsoid's localsettings.js uses "mediawiki::server_url" to construct a URL to
the API, but server_url points at MediaWiki from the host environment's
perspective, using port 8080.

Change-Id: I1b9a89b7b2cb8657ab3225c8346c68853a386bac