[test] add end to end tests

[jmkerloch]

There are no test in the repository.

We need to add some end to end tests for all entry point:

• [x] r2gg:sql2pivot
• [ ] r2gg:pivot2pgrouting
• [ ] r2gg:pivot2osm
• [ ] r2gg:osm2osrm
• [ ] r2gg:osm2valhalla
• [ ] r2gg:road2config

TO BE DEFINED :

• [ ] test framework (suggestion pytest)
• [ ] how to have input data ?
• [ ] how to check results ?