qa: support multiple repositories

Instead of assuming there is only one source code repository and only
one software quality assurance claim, cope with the situations where
there are many.

Also gracefully handle the case where the software quality assurance
target is novalue.

Change-Id: I030a1dc3e6746ab69679cb38bc9c2918be224c4e
Signed-off-by: Loic Dachary <loic@dachary.org>