Silences Javelin UT

This patch prevents Javelin UT from outputing to stderr.

Change-Id: Id9769132fc69b7d2dd1665b498c0c4e868d8846c
diff --git a/tempest/tests/cmd/test_javelin.py b/tempest/tests/cmd/test_javelin.py
index 56bc96c..a174d8e 100644
--- a/tempest/tests/cmd/test_javelin.py
+++ b/tempest/tests/cmd/test_javelin.py
@@ -24,7 +24,7 @@
 
     def setUp(self):
         super(JavelinUnitTest, self).setUp()
-        javelin.setup_logging()
+        javelin.LOG = mock.MagicMock()
         self.fake_client = mock.MagicMock()
         self.fake_object = mock.MagicMock()