[Imports] New Zealand address import

[Andrew Harvey]

> Nodes with only addr:housenumber that aren't part of a relation, and nodes with only addr:housenumber and addr:street - add linz data, move to linz location.

Why move to the LINZ location? If people want the LINZ location they can
use LINZ directly, the location in OSM might be better, and I would
advice caution moving it without a ground survey.