[Tile-serving] [openstreetmap/osm2pgsql] Add minimal testing of flex example configs (#1243)

[Paul Norman]

@pnorman requested changes on this pull request.

Travis is failing with

```
36: /home/travis/build/openstreetmap/osm2pgsql/tests/test-output-flex-example-configs.cpp:10
36: ...............................................................................
36: 
36: /home/travis/build/openstreetmap/osm2pgsql/tests/test-output-flex-example-configs.cpp:27: FAILED:
36:   REQUIRE_NOTHROW( db.run_file(options, data_file) )
36: due to unexpected exception with message:
36:   Error loading lua config: ...eetmap/osm2pgsql/tests/data/../../flex-config/
36:   places.lua:9: module 'dkjson' not found:
36:   	no field package.preload['dkjson']
36:   	no file './dkjson.lua'
36:   	no file '/usr/share/luajit-2.1.0-beta3/dkjson.lua'
36:   	no file '/usr/local/share/lua/5.1/dkjson.lua'
36:   	no file '/usr/local/share/lua/5.1/dkjson/init.lua'
36:   	no file '/usr/share/lua/5.1/dkjson.lua'
36:   	no file '/usr/share/lua/5.1/dkjson/init.lua'
36:   	no file './dkjson.so'
36:   	no file '/usr/local/lib/lua/5.1/dkjson.so'
36:   	no file '/usr/lib/x86_64-linux-gnu/lua/5.1/dkjson.so'
36:   	no file '/usr/local/lib/lua/5.1/loadall.so'
36: 
36: ===============================================================================
36: test cases: 1 | 1 failed
36: assertions: 5 | 4 passed | 1 failed
```



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