tst: fix jinja2 expert test

- the __init__.py was missing. this was the reason that this test was
  never executed before with nose
- set the overwrite parameter to test the behaviour actually

Author: sebix

intelmq/tests/bots/experts/jinja/__init__.py

@@ -52,9 +52,9 @@ def set_bot(cls):
         cls.bot_reference = JinjaExpertBot
 
     def test_jinja1(self):
-        self.sysconfig = {'fields': { 'feed.url': "{{ msg['feed.url'] | upper }}" } }
         self.input_message = EXAMPLE_INPUT
-        self.run_bot()
+        self.run_bot(parameters={'fields': { 'feed.url': "{{ msg['feed.url'] | upper }}" },
+                                 'overwrite': True})
         self.assertMessageEqual(0, EXAMPLE_OUTPUT1)
 
     def test_jinja2(self):