[Rpm-maint] [rpm-software-management/rpm] 3 cleanup fixes (#359)

[Panu Matilainen]

Oh, rpm doesn't do clean-up from signal handlers, that's specifically documented as being unsafe for BDB in particular. Rpm has a "signal queue" which is polled from here and there in the codepaths and that's where cleanup occurs. The race here is that the signal queue for trapping those signals for safe handling was not set up, so rpm would directly exit on signals in that window, and this makes BDB rather unhappy.

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