Move wikitech back to wikitech.wikimedia.org.

https://gerrit.wikimedia.org/r/#/c/140218/ accidentally conflated
$controller_hostname with the webserver name... on wikitech
the controller name is virt1000 but the web frontend lives
at wikitech.  This patch clarifies this and moves the apache
config to wikitech.wikimedia.org.

Change-Id: I47f60c76be0b4e3049d8113d0eb677d57fde1418