test: Convert the vboot test to test/py

Now that we have a suitable test framework we should move all tests into it.
The vboot test is a suitable candidate. Rewrite it in Python and move the
data fi

test: Convert the vboot test to test/py

Now that we have a suitable test framework we should move all tests into it.
The vboot test is a suitable candidate. Rewrite it in Python and move the
data files into an appropriate directory.

Signed-off-by: Simon Glass <sjg@chromium.org>

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