Fix #746 (#769)

also fix broken text env

After the last couple of commits the tests ran correctly only on a
fresh db, in addition, the roles within the db were not created/dropped
on each request and we need that since their privileges differ and we
need to to have an absolute clean db on each execution

test/fixtures/database.sql

@@ -1,3 +1,3 @@
-CREATE EXTENSION IF NOT EXISTS pgcrypto;
-
-ALTER DATABASE :db SET request.jwt.claim.id = '-1';
+set client_min_messages to warning;
+DROP SCHEMA IF EXISTS test, private, postgrest, jwt, تست CASCADE;
+DROP TYPE IF EXISTS jwt_token CASCADE;