Comment 1 for bug 1783635

The error is from libvirt driver calling `guest.migrate_configure_max_speed` here:

https://github.com/openstack/nova/blob/stable/pike/nova/virt/libvirt/driver.py#L6944

That method was not added to the guest module until after Pike (https://github.com/openstack/nova/commit/23446a9552b5be3b040278646149a0f481d0a005) and it doesn't appear to have been backported to Pike as it is missing here:

https://github.com/openstack/nova/blob/stable/pike/nova/virt/libvirt/guest.py

The call to `guest.migrate_configure_max_speed` was added to the driver in this commit: https://github.com/openstack/nova/commit/ff747792b8f5aefe1bebb01bdf49dacc01353348