test/py: Update docs, add requirements.txt for pip

To be more closely aligned with Python community best practices, we need
to better document our usage of pip and make use of a requirements.txt
file that shows the versions of the tools that we are using.  This will
aide in ensuring reproducibility of our tests as well.

Reviewed-by: Simon Glass <[email protected]>
Tested-by: Stephen Warren <[email protected]>
Tested-by: Simon Glass <[email protected]> [on sandbox]
Signed-off-by: Tom Rini <[email protected]>

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