tests/acceptance: console boot tests for quanta-gsj

tests/acceptance: console boot tests for quanta-gsj

This adds two acceptance tests for the quanta-gsj machine.

One test downloads a lightly patched openbmc flash image from github and
verifies that it boots all the way to the login prompt.

The other test downloads a kernel, initrd and dtb built from the same
openbmc source and verifies that the kernel detects all CPUs and boots
to the point where it can't find the root filesystem (because we have no
flash image in this case).

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
Message-id: 20200911052101.2602693-15-hskinnemoen@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>