Split off wikidata into a separate LVS service 'text-varnish'

We are going to test Text Varnish with Wikidata first.

HTTPS and IPv6 will remain on Squid, for now.

Factor out LVS realserver ip include, overriding doesn't seem
possible.

Change-Id: I9a39649a9abb2f8af3862abf36e5c8a2f7542f93