tests: unrepresentable: Prep for richer bahviours

We are going to want to run these tests in different modes, and the
results might vary between mode.

So encode the expected results in the *arguments* to the sub-test
finish subroutine (which we rename).  The filenames go on the sub-test
start subroutine.

finish is going to gain features.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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