Extract configuration strings in separate method

[t-ober]

Currently we parse configurations in test the following way:

          """input.osm.pbf.file = "pbf_file"
            |input.asset.file.directory = "asset_input_dir"
            |input.asset.file.separator = ","
            |input.asset.file.hierarchic = false
            |output.csv.directory = "output_file_path"
            |output.gridName = "test_grid"
            |""".stripMargin

in a lot of places. Extract that into a method returning a correct configuration string and use str.replace to change the part in e.g. ConfigFailFast tests