[nova] There is no screen for UEFI instance from console display

Hi. After launch an UEFI mode instance in OpenStack, the console screen show the message “Guest has no initialized the displayed (yet) " Engage your help, many thanks Base on ubuntu cloud image, listed as below https://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-... <https://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-uefi1.img>