[Tile-serving] [openstreetmap/osm2pgsql] Middle refactorings and tests (#1110)

[Jochen Topf]

@joto pushed 3 commits.

9e9edcb1049d8c97a18a71e5f252605b9ea6a299  Simplify test code
79665aa63c04cd13dd4577814080d942538ab1e1  Refactor test_buffer_t in middle test
c42455cb73b517ee490787fe38cba511862190bf  Add asserts() in middle-pgsql to expose assumptions the code makes


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View it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/1110/files/3e526d73fd05df56caffb88117b67438cab8d8ff..c42455cb73b517ee490787fe38cba511862190bf
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