specifying --qemu-iso to `kola testiso` doesn't seem to work

[dustymabe]

It appears to still use the one from the builds/ directory. Something like this should work:

cosa kola testiso --qemu-iso foo.iso -S --qemu-firmware=uefi --scenarios iso-live-login

Let's investigate.

[jlebon]

I think this is because fundamentally kola testiso operators on a cosa build, not just an ISO. It's a bit of a misnomer since it tests PXE too. It should probably be called kola testlive or something.