Comment 1 for bug 1340087

not 100% sure this is related, but in my recent Devstack/Ironic runs, I've had to revert a nova commit to get pxe boot completing (thanks lucasagomes and dtantsur): "https://review.openstack.org/#/c/71557/33 that's the commit that broke us" - this is:

git checkout bf02f134d711a040b117788009843e7edc9f3040 (the review just before it)