Remove extra GC debug info

This isn't necessary at the moment and can get really verbose.

Change-Id: Ic7c7c73989b4936591f7ed2d3e3635c383bfd9fe
diff --git a/tests/base.py b/tests/base.py
index 2b6147a..f5bb1cb 100755
--- a/tests/base.py
+++ b/tests/base.py
@@ -2222,19 +2222,12 @@
         # Make sure no jobs are running
         self.assertEqual({}, self.executor_server.job_workers)
         # Make sure that git.Repo objects have been garbage collected.
-        repos = []
         gc.disable()
         gc.collect()
         for obj in gc.get_objects():
             if isinstance(obj, git.Repo):
                 self.log.debug("Leaked git repo object: 0x%x %s" %
                                (id(obj), repr(obj)))
-                for ref in gc.get_referrers(obj):
-                    self.log.debug("  Referrer %s" % (repr(ref)))
-                repos.append(obj)
-        if repos:
-            for obj in gc.garbage:
-                self.log.debug("  Garbage %s" % (repr(obj)))
         gc.enable()
         self.assertEmptyQueues()
         self.assertNodepoolState()