Comment 62 for bug 1274034

This is the alternate approach: https://review.openstack.org/#/c/196986/

Very small isolated patch that can be back-ported to Kilo and can be applied by operators to even earlier versions like Juno as well. I think we won't be able to back-port upstream to Juno because the config value was added in Kilo, but the stable team might be able to be convinced otherwise.