fix RT Apache setup

Warning: /Stage[main]/Misc::Rt/File[/etc/apache2/sites-enabled/rt.wikimedia.org]:
Ensure set to :present but file type is link so no content will be synced

apache_site used to make the symlink, replaced by apache::site
meanwhile

Change-Id: Iaab35c9bb5a3b2b84bd4250a75d0a02104ea0576
Merge "fix RT Apache setup" into production