Cirros partition images are not compatible with local boot since they
don't ship grub (nor a normal root partition). This change adds a script
that builds a partition image with UEFI artifacts present. It still
cannot be booted in legacy mode, but it's a progress.
Set the tempest plugin's partition_netboot option. We need it to inform
the tempest plugin about the ability to do local boot. This option
already exists but is never set.
Also set the new default_boot_option parameter, which will be introduced
and used in Iaba563a2ecbca029889bc6894b2a7f0754d27b88.
Remove netboot from most of the UEFI jobs.
Change-Id: I15189e7f5928126c6b336b1416ce6408a4950062
bbceca562e