Clean up after tests

For #64

test/CDB_QueryTablesTest_expect

@@ -13,5 +13,7 @@ CREATE SCHEMA
 CREATE TABLE
 INSERT 0 1
 select * from sc.test|{sc.test}
+DROP TABLE sc.test;
+DROP SCHEMA sc;
 SELECT
 * FROM geometry_columns|{pg_catalog.pg_attribute,pg_catalog.pg_class,pg_catalog.pg_namespace,pg_catalog.pg_type}