[Rpm-maint] [rpm-software-management/rpm] Be much more careful about copying data from the signature header (#1577)

[Panu Matilainen]

Split the optimization part to a separate commit so the first one can be safely picked for old versions.
I merged the MINMEM part to the first commit though - I had some kind of reason to not put it there in the first place (probably just that MINMEM is a bit iffy in the first place), but thinking it again, MINMEM is what the header iteration does so in a way this is closer to the original behavior.

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