[Tile-serving] [openstreetmap/osm2pgsql] Include tests for sample configuration file (#1130)

[Paul Norman]

Any complex lua transform should have tests to check expected behavior against actual behavior. For the pgsql backend an example is [OpenStreetMap Carto's tests](https://github.com/gravitystorm/openstreetmap-carto/blob/master/scripts/lua/test.lua). For the multi-backend, an example is the extensive set of tests in the [test-* files of cleartables](https://github.com/ClearTables/ClearTables).

Because flex includes complications like callbacks into osm2pgsql code, we should supply tests along with the examples.

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