Provision performance.wikimedia.org

This patch configures performance.wikimedia.org as a static site served by
Apache on tungsten.wikimedia.org and situated behind the misc-varnish cluster.
The site will contain noninteractive performance dashboards.

Change-Id: Ied972eea35a1662eff355419088edf262727cd7d
Merge "Provision performance.wikimedia.org" into production