b57b94bbad
Set the Ironic boot mode to legacy BIOS explicitly in Tenks config in anticipation of an upcoming change to the default boot mode. Override the boot mode to UEFI in the overcloud TLS job to improve coverage. This requires enabling iPXE booting. Depends-On: https://review.opendev.org/c/openstack/tenks/+/827479/ Change-Id: Id1b4e9775c834b8b97e086241ee8b247977225a2