[Rpm-maint] [rpm-software-management/rpm] Make sure all dependencies for scriptlet are installed before executing them (#436)

[Jeff Johnson]

Delaying scriptlet execution until after a SCC (if you prefer that term) is one approach to avoiding indeterminism from lack of ordering within an SCC: any/all executables within the SCC are guaranteed to be present.

I tried to point out that delaying scriptlet execution adds a different type of indeterminism in choosing when to run scriptlets, not just the order in which to run  scriptlets, during an install.

The extreme case, where the entire transaction is an SCC, and all files are installed before scriptlets are run, is identical to the case of not needing package ordering through dependency prerequisites whatsoever.

Try and see whether installations are more robust and breakage rarer by delaying scriptlet execution.

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