[Tile-serving] [openstreetmap/osm2pgsql] Refactor tests pg code (#1025)

[Jochen Topf]

@joto pushed 4 commits.

38fb87b224d39b20fb13c24c4f56305885fa57d7  Rename pg_result_t::get_value() to pg_result_t::get_value_as_string()
2d6fb6a00d28e087b512d3a785c8bbbfee6e825c  Remove unused function
f12f13d0bfa90133372116a7d17be330bcba0345  Use new pg_result_t::get_value() function everywhere
695337a74883092f3ce588e44fe5aca3644a41e5  Cleanup of pgsql classes


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View it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/1025/files/ca32fa284a169d83ef624e3ebc145c7ed71d3342..695337a74883092f3ce588e44fe5aca3644a41e5
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