Rebooting nodes in the VTE lands one in a UEFI shell

Rebooting should land us back in the OS. I suspect this is a boot option issue as we set netboot as the default, but the disk boot does not seem to be set up properly.

For a workaround see

• https://forum.mergetb.net/t/booting-into-the-os-image-from-the-uefi-shell/43