Per the bug mentioned upstream, grub2-mkconfig will currently not set
the kernel options for BLS entries prefixed with a machine-id
different to the running system.
This affects the centos element, as the upstream .qcow2 comes with a
pre-existing BLS entry but a blank machine-id. This only affects
9-stream -- prior releases either don't use BLS or have entries
configured to use a common variable from grubenv which is updated
correctly.
We currently can not end-to-end test this in OpenDev because we run
our functional tests on Ubuntu Focal (they use devstack), whose kernel
can not read the XFS format on the 9-stream .qcow2. This expands the
functional tests (that run on Debian Buster, with a later kernel) to
add the vm element, so the bootloader path is exercised (this requires
a block-device too). This at least runs the bootloader install, we
can confirm the kernel options look right from the dumping provided
the logs.
Change-Id: I327f5e7a95e47905c01138c8c4483f3f03e8efff
53d04d27c6