oeqa/selftest/sstatetests: prettier output for allarch test

Instead of creating two lists of full paths and comparing them which in failure
produces a list of every stamp file (so all tasks, twice), reduce the filename
down to a recipe/task->hash dictionary and compare those, meaning unittest
shows the differences in the dictionaries.

In the future get_files() should be generalised so all tests in this class can
use it, and find a pair of hashes that don't match and run diffsigs on them.

Signed-off-by: Ross Burton <ross.burton@intel.com>

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