convert docstrings to comments

Convert docstrings to comments so that it's easier
to track down what tests are running under nose

Change-Id: Iab2c303a54983700c7ab25437c8324b95b341754
diff --git a/tempest/tests/compute/test_extensions.py b/tempest/tests/compute/test_extensions.py
index 552c58c..829e295 100644
--- a/tempest/tests/compute/test_extensions.py
+++ b/tempest/tests/compute/test_extensions.py
@@ -24,7 +24,7 @@
 
     @attr(type='positive')
     def test_list_extensions(self):
-        """List of all extensions"""
+        # List of all extensions
         resp, extensions = self.client.list_extensions()
         self.assertTrue("extensions" in extensions)
         self.assertEqual(200, resp.status)