misc::statistics::sites::default: use apache::site, not apache::vhost

apache::vhost is deprecated; this and phabricator are the remaining users.
(There's a patch for removing the deployment one in labs).

Port it to apache::site by copying the actual generated apache config file from
stat1001 over to files/apache/sites. I didn't modify it except to remove the
(now-inaccurate) comment header and to tidy up whitespace.

Change-Id: I7ee16003845024ab1600687732a0651c17e380c7
Merge "misc::statistics::sites::default: use apache::site, not apache::vhost" into production