Port more unit tests to Python 3

* Replace string.find(a, b) with a.find(b)
* NamedTemporaryFile: open file in text mode rather than opening it
  in binary mode.
* Module.process_contents(): if contents is a Unicode string, first
  encode it to UTF-8 before hashing the content to MD5.
* ClusterController: replace dict.items()[0] with next(iter(dict.items()))
* tox: run the following tests on Python 3.4

  - mysql/test_common.py
  - taskmanager/test_models.py
  - module/test_module_models.py
  - test_cluster_controller.py

Partially implements: blueprint trove-python3
Change-Id: I5372520f9717b4f0279c4b436ca88c160ddf894b

1 files changed, 3 insertions, 2 deletions

diff --git a/trove/tests/unittests/taskmanager/test_models.py b/trove/tests/unittests/taskmanager/test_models.py
index 1698e6e0..a385a7f5 100644
--- a/trove/tests/unittests/taskmanager/test_models.py
+++ b/trove/tests/unittests/taskmanager/test_models.py
@@ -193,10 +193,11 @@ class FreshInstanceTasksTest(trove_testtools.TestCase):
         self.orig_DBI_find_by = DBInstance.find_by
         self.userdata = "hello moto"
         self.guestconfig_content = "guest config"
-        with NamedTemporaryFile(suffix=".cloudinit", delete=False) as f:
+        with NamedTemporaryFile(mode="w", suffix=".cloudinit",
+                                delete=False) as f:
             self.cloudinit = f.name
             f.write(self.userdata)
-        with NamedTemporaryFile(delete=False) as f:
+        with NamedTemporaryFile(mode="w", delete=False) as f:
             self.guestconfig = f.name
             f.write(self.guestconfig_content)
         self.freshinstancetasks = taskmanager_models.FreshInstanceTasks(