Comment 6 for bug 1604335

One more quick note, with https://gist.github.com/bloodeagle40234/f4c0cd267e085cc6224ffdc1b1822631 we can confirm my patch https://review.openstack.org/#/c/344066/ decrease "possibly lost" and "still reachable" counts on valgrind --leak-check=full before/after the patch.