Use multi-chunk RAID 1C with keydisk on softraid enabled archs
Keydisks requires special treatment and should not be touched by installboot.
In real setups they are probably offline (temporary USB stick, only present
during boot to unlock), but when they are around (keydisk chunk on same disk
as crypto volume)...
installboot currently installs treats keydisk like any other chunk, which
must be fixed.
Thus change the tests into a should-work-but-currently-broken setup so an
installboot fix can be immediately tested against it.
projects / openbsd / commit