As reported at https://bugs.launchpad.net/devstack/+bug/1532924/comments/2, merely getting the correct MTU calculcated is not enough, we also have a problem getting the calculated value set on the network interface inside the VM.
As reported at https:/ /bugs.launchpad .net/devstack/ +bug/1532924/ comments/ 2, merely getting the correct MTU calculcated is not enough, we also have a problem getting the calculated value set on the network interface inside the VM.