Excessive road names at zoom 15

[nvkelso]

In #2019 we stripped names from short road segments (good). But looking at 512px sized 14/9612/6755.mvt I still see a huge amount of names on minor_roads, with names unique in English and Arabic. Most or all of those road features shouldn't have names, and should be merged into a huge multilinestring.

[nvkelso]

Another example in Venice with 512px sized 14/8753/5865.mvt where minor pedestrian paths are all getting long names.