bdd: run all setup via nominatim Python library

Drops all calls to PHP utility functions. nominatim cli functions
are used where possible, to stay as close to the final code as
possible with the tests.

By removing the PHP calls, the test code now only uses osm2pgsql and
the database module from the build directory.

test/bdd/steps/steps_db_ops.py

@@ -86,10 +86,24 @@ def import_and_index_data_from_place_table(context):
     """ Import data previously set up in the place table.
     """
     context.nominatim.copy_from_place(context.db)
-    context.nominatim.run_setup_script('calculate-postcodes')
+
+    # XXX use tool function as soon as it is ported
+    with context.db.cursor() as cur:
+        with (context.nominatim.src_dir / 'lib-sql' / 'postcode_tables.sql').open('r') as fd:
+            cur.execute(fd.read())
+        cur.execute("""
+            INSERT INTO location_postcode
+             (place_id, indexed_status, country_code, postcode, geometry)
+            SELECT nextval('seq_place'), 1, country_code,
+                   upper(trim (both ' ' from address->'postcode')) as pc,
+                   ST_Centroid(ST_Collect(ST_Centroid(geometry)))
+              FROM placex
+             WHERE address ? 'postcode' AND address->'postcode' NOT SIMILAR TO '%(,|;)%'
+                   AND geometry IS NOT null
+             GROUP BY country_code, pc""")
 
     # Call directly as the refresh function does not include postcodes.
-    indexer = Indexer(context.nominatim.test_env['NOMINATIM_DATABASE_DSN'][6:], 1)
+    indexer = Indexer(context.nominatim.get_libpq_dsn(), 1)
     indexer.index_full(analyse=False)
 
     check_database_integrity(context)