Temporarily disable test_dependent_behind_dequeue

It times out a bit too often.  We need to dig into it but it will
take some time.

Change-Id: I8e2ed0641aad02dd835f6962934f8eeb104333d7
diff --git a/tests/unit/test_scheduler.py b/tests/unit/test_scheduler.py
index 4aa9b6f..03aff00 100755
--- a/tests/unit/test_scheduler.py
+++ b/tests/unit/test_scheduler.py
@@ -1273,6 +1273,7 @@
         self.assertEqual(self.getJobFromHistory('project-test2').result,
                          'FAILURE')
 
+    @skip("This test generally works but times out frequently")
     def test_dependent_behind_dequeue(self):
         "test that dependent changes behind dequeued changes work"
         # This complicated test is a reproduction of a real life bug