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/jwt.sql

@@ -1,5 +1,6 @@
 -- From michelp/pgjwt commit c02bbd3
 BEGIN;
+set client_min_messages to warning;
 DROP SCHEMA IF EXISTS jwt CASCADE;
 CREATE SCHEMA jwt;