Raise error if we try to controll a non controller server

Fix #451

tests/handlers/api/controller/test_version.py

@@ -49,6 +49,12 @@ def test_version_invalid_input(http_controller):
                              'status': 409}
 
 
+def test_version_not_controller(http_controller, config):
+    config.set("Server", "controller", False)
+    response = http_controller.get('/version')
+    assert response.status == 403
+
+
 def test_version_invalid_input_schema(http_controller):
     query = {'version': "0.4.2", "bla": "blu"}
     response = http_controller.post('/version', query)