Use the public gear API to iterate over jobs in the queue

Also, add some more info about testing.

Change-Id: I2029a03d2ab017d826b01dc0b802c6e0e0328204
diff --git a/TESTING.rst b/TESTING.rst
index f3fa28e..293bb83 100644
--- a/TESTING.rst
+++ b/TESTING.rst
@@ -61,6 +61,12 @@
 
   .tox/py27/bin/python -m testtools.run tests.test_scheduler.TestScheduler.test_jobs_launched
 
+List Failing Tests
+------------------
+
+  .tox/py27/bin/activate
+  testr failing --list
+
 Need More Info?
 ---------------