Apache: listen on both 80 & 8080.

Having the server listen on port 80 is nice because it allows the user to omit
the port when (for example) cURLing a URL from the guest. But serving on port
8080 means there is a canonical way of addressing resources that is consistent
on both guest and host.

Change-Id: I6adfbb97fe6e322cbae25ae4936e5018b25fb22c