tests: make tests (nearly) work with python3

Tests work now with python 3 with the exception of the deletion of remote
testfolders which fails for some reasons.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

test/tests/test_01_basic.py

@@ -65,7 +65,7 @@ class TestBasicFunctions(unittest.TestCase):
         code, res = OLITestLib.run_OLI()
         self.assertEqual(res, "")
         boxes, mails = OLITestLib.count_maildir_mails('')
-        self.assertTrue((boxes, mails)==(0,0), msg="Expected 0 folders and 0"
+        self.assertTrue((boxes, mails)==(0,0), msg="Expected 0 folders and 0 "
             "mails, but sync led to {} folders and {} mails".format(
                 boxes, mails))