[MERGE] overhaul RepositoryTestAdapter

[Robert Collins]

This cleanup will allow trivial extension of Repository test adaption by
adding a scenario to the end of of the scenarios list before adapting
tests - which will be used by the shallow branches work in the near
future.

Cheers,
Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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