[test] port test to 3.19 API

And add a commit() during setUp.

test/unittest_rqlcontroller.py

-# -*- coding: utf-8 -*-
-# copyright 2013-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# copyright 2013-2016 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 # contact http://www.logilab.fr -- mailto:contact@logilab.fr
 #
 # This program is free software: you can redistribute it and/or modify it under
@@ -36,6 +35,7 @@ class RqlIOTc(CubicWebServerTC):
         super(RqlIOTc, self).setUp()
         with self.admin_access.client_cnx() as cnx:
             self.create_user(cnx, u'toto', password=u'toto')
+            cnx.commit()
 
     def connectedRQLIOSession(self, login='admin', password='gingkow'):
         rsession = requests.Session()
@@ -86,9 +86,10 @@ class RqlIOTc(CubicWebServerTC):
         rsession = self.connectedRQLIOSession()
         res = self.assertRQLPostOK(rsession, queries)
 
-        self.assertEqual('pachyderms',
-                         self.execute('Any N WHERE U in_group G, U login "Babar", '
-                                      'G name N').rows[0][0])
+        with self.admin_access.client_cnx() as cnx:
+            self.assertEqual('pachyderms',
+                             cnx.execute('String N WHERE U in_group G, U login "Babar", '
+                                         'G name N').rows[0][0])
         output = [x for x, in res.json()]
         self.assertEqual(1, len(output[0]))
         self.assertEqual(1, len(output[1]))