Fix lint in unit tests re: py3-first and py2 compat

Change-Id: Iaafe2c368390706a61976d3f13fd83d515ce4b3e

unit_tests/test_ceph_broker.py

@@ -28,7 +28,7 @@ class CephBrokerTestCase(unittest.TestCase):
     def test_process_requests_invalid_api_version(self, mock_log):
         req = json.dumps({'api-version': 2, 'ops': []})
         rc = ceph_broker.process_requests(req)
-        print "Return: %s" % rc
+        print("Return: {}".format(rc))
         self.assertEqual(json.loads(rc),
                          {'exit-code': 1,
                           'stderr': 'Missing or invalid api version (2)'})

unit_tests/test_utils.py

@@ -110,7 +110,7 @@ def patch_open():
 
     Yields the mock for "open" and "file", respectively.'''
     mock_open = MagicMock(spec=open)
-    mock_file = MagicMock(spec=file)
+    mock_file = MagicMock(spec=file)  # noqa - transitional py2 py3
 
     @contextmanager
     def stub_open(*args, **kwargs):