(_check) honor per medium "verify-rpm" option for missing signature check

aka do not check too early about unsigned packages (missing signatures)
(fix testsuite, regression introduced in commit r5393)

rationale:
we wanted to warn about missing signatures on packages from media
without signatures, but in doing so we did it too early before the
'verify-rpm' option check
since we already have a check after (when we have a medium key), we can
just check here for packages that do not came from any mirror (which we
would have skiped just after)

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