oeqa/selftest/recipetool: add back checksum checks on pypi tests

oeqa/selftest/recipetool: add back checksum checks on pypi tests

recipetool pypi plugin was originally clobbering SRC_URI checksums.

Now it doesn't do this anymore:
78ef0313ee6 - recipetool: pypi: do not clobber SRC_URI checksums
so add back the checksum checks on pypi tests.

Also this commit restrict the checksums:
45d2f8d4bc2 - recipetool: create: Only include the expected SRC_URI checksums
so add only the needed ones.

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>