Add more debug logging to download detached volume test

Signed-off-by: Prasanna Santhanam <tsp@apache.org>

test/integration/smoke/test_volumes.py

@@ -521,13 +521,15 @@ class TestVolumes(cloudstackTestCase):
         #Attempt to download the volume and save contents locally
         try:
             formatted_url = urllib.unquote_plus(extract_vol.url)
+            self.debug("Attempting to download volume at url %s" % formatted_url)
             response = urllib.urlopen(formatted_url)
+            self.debug("response from volume url %s" % response.getcode())
             fd, path = tempfile.mkstemp()
+            self.debug("Saving volume %s to path %s" %(self.volume.id, path))
             os.close(fd)
-            fd = open(path, 'wb')
-            fd.write(response.read())
-            fd.close()
-
+            with open(path, 'wb') as fd:
+                fd.write(response.read())
+            self.debug("Saved volume successfully")
         except Exception:
             self.fail(
                 "Extract Volume Failed with invalid URL %s (vol id: %s)" \