[Rpm-maint] [rpm-software-management/rpm] Implement alternative transaction callback style (#1365)

[Jaroslav Rohel]

@pmatilai 
Python API:
>From my point of view the new mode arguments (rpmte, what, amount, total, userdata) are much better than the old ones. And it is almost the same as in the new C API mode.
I prefer to drop "key" argument from this new API. 

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