More consistent loading of the test fixtures (#1506)

Remove db setup from the Haskell test suite and include it in the test bash scripts.

test/fixtures/jwt.sql

@@ -1,5 +1,8 @@
 -- From michelp/pgjwt commit c02bbd3
 BEGIN;
+
+set search_path to public;
+
 set client_min_messages to warning;
 DROP SCHEMA IF EXISTS jwt CASCADE;
 CREATE SCHEMA jwt;