PROV-823 Reworked Google address lookup in Geocode attribute value

We were still using their maps API v2 which has been completely shut
down recently. This went unnoticed because most of the lookups are now
done through OpenLayers via JS. This only comes up when you pass text
values directly, i.e. via importers or web service calls.

Also added a simple unit test that makes sure the next time they change
their API it doesn’t go unnoticed.
NOJIRA Removed debugging statement