Add RPMCALLBACK_SCRIPT_ERROR callback type

- TS callback has a better chance at doing something semi-intelligent
  on scriptlet failure than rpmlog callback
- Hijack "amount" for script tag that failed, "total" for exit code
  which might be pretty much anything: waitpid child, actual exit status or
  lua error... not probably very useful in the callback but...
- Notify before logging so users can catch the actual error message
  on next rpmlog callback.. or something

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