Production rollouts fail since testopenid vhost config isn't defined

Edge rollouts are currently blocked due to vhost.testopenid not being found. This will probably affect other production rollouts as well.

When trying to start Launchpad with a config that redifines the vhost configs, it fails if vhost.testopenid.hostname isn't defined:

  https://pastebin.canonical.com/28308/

This happens even though utilities/lsconf.py says it is defined:

  https://pastebin.canonical.com/28309/

This patch to lp-production-configs fixes it for edge, but we should fix it in a way so that we don't have to modify the production configs, since we'd probably have to update staging, lpnet, etc.:

  http://pastebin.ubuntu.com/382826/