[Rpm-maint] [rpm-software-management/rpm] lua: add rpm.execute() (#390)

[Jeff Johnson]

The real flaw with looping over close(fdno) before exec in rpm is that it masks the root cause of the problem: applications that are not setting FD_CLOEXEC.

The loop also prevents an application from intentionally passing an open fdno to a child of rpm (if that is/was intended).

I'd suggest removing the loop entirely (or logging leaky fdnos) so that applications can be fixed directly: it's not a difficult patch in most cases.

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