[Rpm-maint] [rpm-software-management/rpm] Support RPMSCRIPT_FLAG_CRITICAL for posttrans (Discussion #3044)

[licunlong]

**Is your feature request related to a problem? Please describe.**

When upgrading kernel, we will make initrd in `posttrans` script. But the process of making initrd may fail in some unusual situations, and we only get a warning message, the rpm command returns 0. 

If the rpm command is running in a script, we will treat it as a successful kernel update by mistake, and then reboot. But becasuse the initrd wasn't successfully built, the reboot will enter emergency mode.

**Describe the solution you'd like**

Support some options to make `posttrans` script (can also be for `post`, `postun`...) used for failure as RPMSCRIPT_FLAG_CRITICAL.

**Describe alternatives you've considered**

Add a new `posttrans_critical`, it supplies the same function as `posttrans` except the error of script is treated as critical.

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